So, I take it you also don't believe in vaccines or take antibiotics when you get sick, right? After all, vaccines are only good for some of what's out there and once you get sick, you're already hosed. Sarcasm aside, there was an old saying about an ounce of prevention.

Build a city surrounded with the tallest, thickest, and strongest walls you can think of (or afford). It's great security, but only from the outside world. Since its impossible to guarantee every citizen isn't a mass-murderer or kleptomaniac, we also have to have locks on individual houses.

Build a network with the nicest firewall/IPS/IDS/whatever you can thing of (or afford). It's great security, but only from the outside world. Since its impossible to guarantee every guest laptop isn't loaded with viruses or malware, we also have to have firewalls on individual workstations.

True story: http://www.ethicalhacker.net/component/option,com_smf/Itemid,54/topic,5220.msg26559/topicseen,1/

Zynga was actually the tipping point for me closing my Facebook account. The privacy issues didn't harm me since I didn't put in any information you couldn't find in a phonebook, but the endless stream of "Alice reamed Bob's mafia in AssWars!" messages killed it for me.

According to my memory monitor, I'm only consuming 15% of the RAM I have available and I'm running Windows 7! Of course it may also be because I have 12GB of RAM...