Back briefly to the topic of threat changes, I do think the threat has changed. In south Texas we have Mexican Mafia and the Zetas competing for territory, and sometimes the violence spills over the edges into "nicer" areas. These guys are heavily armed and armored. This didn't use to be the case.

Also, I'm told by my instructor, that a lot of the individual assailants are tied to the two groups - out for pocket money, I guess...

I wonder what the groups think of the shooter when one of theirs is ventilated by an upright citizen, and that definitely didn't use to be the case.