Because I usually cleaned them up before they got out of hand.
You're still limiting the data set to the instances that involve a neg rep assault. My point is that those are ridiculous few relative to ALL new members. I'm saying that the totality of new posters who register don't ever have to worry about gold badgers zapping them with neg rep because most newbs know how to join respectfully and without acting like they own the joint. It's ONLY the ones who forgot to leave their asshattery at the door that got it. And rightfully so, IMO.