God, there are a lot of fucking ignorant hippies on this website.
Convoys have to keep moving continuously. Stopping could give an opportunity for an ambush or an IED attack. If these civilian cars are driving too slowly, our soldiers have no option but to tap them so they'll get out of the way. If you want us to stop harmlessly tapping the back of an Iraqi's car, then go talk to the fucking Muslim assholes who are trying to slaughter our men in uniform, and tell them to stop planting IED's.
You've summed up nicely what some of us have been saying