For those of you that don't believe SHTF would ever happen in the U.S., it's already started in a few cities. There are many states where government employee pensions are only half funded, when those states go belly up, things will get interesting. California, Illinios or Michigan will probably be the first to go.
http://www.shtfplan.com/headline-news/murder-rape-robbery-and-assault-skyrocket-in-bankrupt-stockton-california_10242012
http://www.shtfplan.com/headline-news/murder-rape-robbery-and-assault-skyrocket-in-bankrupt-stockton-california_10242012