U.S. Snipers Allegedly 'Baited' Iraqis

In Vietnam our troops would lay down a rifle on a trail that was booby trapped to explode when someone fired it. I don't see a problem with snipers baiting targets with the right bait. I'm wondering how others feel about this type of inflicting casualties since we used these tactics in Vietnam and nobody seemed to think it was a problem as far as I know.