"You already live in that world. The only question left is if every sane and law abiding citizen should also be able to get a gun to protect themselves."
Maybe you do.
If you live in so much fear you feel the need to protect yourself with a gun you may want to consider moving to a more civilized part of the world.
To many people guns are things you see on television, or occasionally carried by specially trained armed response police.
Sorry, you live in that world. The fact that violence hasn't entered your life as yet does not change the nature of the world or alter reality in the slightest. Some people see the world for what it is and reasonably take precautions. Others deny the nature of the world and hide behind "specially trained armed response police". I would never want to deny people their right to self delusion but I draw the line at when they wish to push their delusions on others.
Just because the wolf hasn't come to pound on your door yet doesn't mean he doesn't exist. Count your blessings and be thankful for that, but do not think that simply because it hasn't happened yet that it cannot happen to you.