Why do people criticized airstrikes?

Read tactics of the crescent moon. It covers that issue very in depth. When I was in Baghdad we called in a stike I was not comfortable with. The official report said we killed six terrorists. From where I was I thought we hit the wrong building. Also, watch Restrepo. Its actual footage of a unit in Afghanistan. The CO calls in a strike which kills a family. In guerilla warfare killing one civilian screws your efforts. Its tough, what do you do.