It's not like Reno is Detroit, but some of us travel a lot. Sometimes to worse places. Also, with a time of falling living standards, etc, it's not a bad idea to brush up on what the street criminal mindset is, as the next generation will undoubtedly have record numbers.
I found the OP in this thread a good check, something that really should be required reading. Even if self-defense isn't your thing, it's still good information. If you happen to have a lot of time, some of the replies have additional views as well.
http://www.ar15.com/forums/t_1_5/128...cs.html&page=1