But seriously, does sharing your DNA mean that you lose all ability for rational thought? Explain that to me.
When your kid rearends someone, it doesn't really matter what the other guy was doing, whether he was driving erratically or stopped suddenly or didn't signal - your kid still rearended him. And the fact that your kid pushed that guy into oncoming traffic. . . . well, speed on the part of the oncoming traffic STILL does not absolve your kid of responsibility. Because yes, it is his fault!!!
When you kid is following someone, and they turn right onto another street, is is your kid's fault that the other car was stopped waiting to turn left and your kid rearended her. You have lost your mind if you honestly think that the woman didn't have a right to stop. Your kid rearended her. Yes, it is her fault.
When your kid backs out of a parking spot and hits another vehicle that was also backing, yes, it is both their faults. Deal with it!
And remember this as well - you weren't there!!!!! You have no fucking idea that happened. And I'm sure your kid has NEVER, EVER lied to you to get out of trouble. I'm sure your kid walks on fucking water while feeding the homeless and curing cancer. But guess what? They're still at fault. Try teaching them responsibility, not deniability. We don't need that many more politicians!