First, you gotta get their attention!
Seriously, the USA has taken a beating in the press, domestically and internationally for just about everything in Iraq, and especially "failing to stop or control looting".
I agree that their tactic seems harsh, but consider these two thoughts, 1) They will be less tempted to go out and steal again, and 2) Saddam Husseins regime would have most probably tortured them and their families, then killed them for stealing.
dago