Ok, I agree I didn't make things better by tapping the brakes, but I've got a truck less than a foot from my bumper, in heavy traffic doing 50-60 mph. This guy smashing into me at that speed could push me into someone else, causing a multiple car collision. This guys endangering more than just my rear bumper. I didn't jump on the brakes enough to make anyone else have to brake, only him because he was riding me.
Realistically, you think "law enforcement" is going to be around when this stuff happens? They rarely are (nothing against the cops, it's just a numbers game, many more of us than them and they can't be everywhere at once).