The difference in what your suggesting is to move, id rather just use common sense & keep myself out of situations were a gun would be needed, plus the fact that a gun is usually (obviously depends on the model) well under a $1000.
Moving on the other hand cost well in excess of $100,000 not to mention the fact that its not that bad around here. I just work in an oddball area of town and its literally just 1 city block thats messed up. Miles in either direction are quite. Not once have I had a problem at my home.
Being 100% safe is not possible, but as said before id rather have it and never need it then need it and not have it. You can run into a nutcase anywere at anytime. Sure 99% of the time nothing ever happens, but should something happen and a loved one is with you what are you going to do? Call the cops and hope they show up in time? While your completly at the mercy of someone else for however long it is?
Comon man, just because some of us carry a firearm doesnt mean we are paranoid. Sure the above situation is an extremly rare one and will probably never happen. I sure hope it doesnt, but you just never know,