John Lott touches on the situation in Iraq with regards to armed or disarmed civilians.
"The argument seems straightforward Enough: Get rid of guns, and the Iraqis can't harm our troops. Banning the carrying of guns also makes it easier for soldiers to simply arrest anyone they are suspicious of.
Yet, the question is more complicated: If guns are banned, who would turn them in? Presumably the most law-abiding citizens - not the terrorists and Ba'ath Party members whom our troops should be concerned about."
Read the entire piece for yourself. & thanks to Sasha Volokh for the link.