Any urban environment is 9 meals away from anarchy (credit to Kevin Reeve, OnPoint Tactical). After three days with no food, you will find that civil order goes right out the window. People will form groups because a group is more effective. Those groups will take up arms because a group with weapons is more effective. Those groups will take what they want, and they will kill you without thinking twice if they believe that killing you will keep them alive. By the same token, killing them might keep you alive if they're coming for your a) food b) shelter c) family.
Man is not civilized. We have the veneer of culture and civilization, but it is tenuous. Without power you will quickly lose food and sanitation, and after 3 days of that you'll see how civilized man is. The concept is difficult to embrace - we all want our neighbors to be reasonable. We want ourselves to be reasonable. However, if you are unwilling to look at the avenue of anarchy as one of the scenarios for which you should prepare, then you will find yourself unprepared if those whom you hope are civilized in the face of death turn out to be something else.
There are two types of disaster for which one should prepare - short-term (up to two weeks) and long-term (one to six months). Anything longer than six months will likely result in a huge change as you adapt to your new life, so planning to "weather" that disaster type may be more difficult than planning to adapt to it permanently (think post-nuclear, health epidemic, other massive destruction on a global scale). A short-term disaster can be weathered in your home with adequate food, water, and security. There are specific skills you can learn that will make survival in an urban environment easier (again, see OnPoint link above), and if you have to escape the city, those skills are even more valuable. Once outside of the city, wilderness survival skills will be a necessity. A long-term disaster is one where civil order breaks down and your survival becomes paramount. For this you should have plans that include evacuation routes (don't take the freeway or you'll find yourself sitting there days later without fuel in your car), food/supply caches along those routes, and a plan for long-term survival in a location where you will be safe.
It is unfortunate, but those who are not able to protect themselves and their families will likely die. Protect doesn't mean only with weapons in the event of an attack. Protect means "find food when your local grocery is empty." Protect means "find shelter that will keep us warm in winter if there is no heating oil." Protect means "understand basic medical treatment" and "maintain calm in a situation of terrible stress." If you have not prepared for a disaster, then when the disaster strikes, what's your plan? To go to the shelter and wait for the government? Those in New Orleans who went to the Superdome found themselves the victims of gangs of thugs and rapists demanding payments for using the toilets. I'll leave discussion of the type of payments accepted as an exercise for the reader.
Japan is an interesting case because civil order has been maintained. I don't know the reason behind this - maybe it's cultural. Maybe it's the respect they have for one another. Maybe it's because there is no food for anyone to take because everything was wiped out. People are leaving the areas of destruction and going to other cities where they have family, so perhaps the local suffering is manageable. Japan's disaster response from the government also appears to have been well-executed. This post-disaster stability is the exception. It is not the norm. If your community handles its disasters with the same calm, then you are fortunate.
Unless you plan to not be a victim, then you will find yourself exactly where you planned to be.
To answer the OP's question, I currently live in Kraków, Poland and go back and forth between Kraków and New York. My wife and I have 30 days of non-perishable food and bottled water in our home and the ability to create fire and cook using small amounts of various fuel types (alcohol penny stoves and two large rocket stoves made from 5L Heineken kegs). I have a Toyota Land Cruiser that runs on diesel fuel, and this summer we'll be preparing remote caches for supplies outside of the city in the event we have to leave. We have camping supplies (tent, sleeping bags, knives, machete, axe, 2-way radios, etc). Gun control in Poland makes it difficult to get a handgun or rifle/shotgun, but if I could, I would get a 12-gauge shotgun because of its versatility for both hunting and defense. We both have training in urban survival and I have training in wilderness survival. We're both trained in Krav Maga. Our caches will contain hard and soft copies of important documents and data (passports, identity cards, marriage license, birth certificates, etc), some money, and additional supplies. For the business we have copies of all of our data and documents in a massive fire safe. For short-term disasters this is fine. For a long-term disaster this should also be fine. Honestly, if I have to survive six months outside of the city, something bad happened. I may not go back to working in IT or even using computers for a long time.
This year we're going to be moving back to the US, and we talked about if it made sense to move back to New York (I own businesses in NYC and in Kraków). We decided that we'll be moving to Colorado instead, and the decision was largely based on the need for flexibility. In Colorado we have the same ability as we do here to weather a disaster in the city or move outside of the city to a safer area. In Colorado it's also easier to purchase firearms than it is in NYC.
I don't believe that I'm any sort of survival nut or apocalypse junkie. I'm not worried about the Chinese or the Terrorists - I'm more worried about the US government screwing its people than anyone screwing the US. However, I do believe very strongly in being prepared and in being flexible. My approach here is the same as my approach to firearms training: despite how you feel about firearms, if you ever have to shoot a gun, it's a very bad time to learn. Hope for the best. Prepare for the worst.
I lived in two of those nice neighborhoods in Colorado Springs in 1998. At the time I was a Java developer for MCI working on their Local Care system. In one house I lived alone, and in the second house I had three hot goth girls as roommates. I'm 6'4" (190cm) tall, have long hair and tattoos, dress in all black w/ combat boots, ride a loud motorcycle, and at the time had a sports car with a loud audio system installed. On two separate occasions the police were dispatched to my house by anonymous tips from the neighbors about drug parties, the manufacture and sale of narcotics, prostitution and other lies. The truth was that I threatened their nice gated community by looking different. On one visit they sent a vice detective with two uniformed officers to ask if I would sign a waiver that would allow them to search my house. I politely declined.
Some neighborhoods have trash that needs to be cleaned up. Some people are just individuals. Anonymizing the reporting system opens it up for abuse and _does_ lend it towards spy-on-your-neighbor big brotherism. What if you see your neighbor smoking something from something that looks like a bong, but he's inside his house when you see him do it? What if you're naive and didn't realize that the "bong" was a vaporizer for asthma relief? I believe that people should be allowed to face their accusers and an online system that encourages reporting of neighborhood faults needs to have protection built in against false reporting. What if the graffiti is on my house, and I like it because I'm into urban art? Control over neighborhood issues isn't a wiki - it's wrong to expect that someone's mistake will be cleaned up by someone else. When one person's mistake is an uninformed retaliation against another person's innocent and legal behavior, the law and society tend to favor the one who made the knee-jerk reaction. Does this mean that more of society is uninformed and they're protecting their own? Or am I truly bad for the homeowner's association because I don't conform to their standard?
The new format is simply a 1GB MicroSD card with mp3 music encoded with up to 320kbit/s. To my surprise the cards will come to you without any DRM protection whatsoever. The retail versions of the so-called "Slot Music" media also contain USB-adapters for easy use on PCs and Laptops. But with MicroSD slots absent from most media players including Apples Iphone and Ipod chances are this format will go the way of the HD-DVD"
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