The problem is not that users aren't following the rules. The problem is that enforcement is, shall we say, very selective. To give but one example, Mitch McConell's account just got banned for posting a video of a protest outside his house.
I don't agree with this action, but it's consistent with their TOS. I don't believe I've seen other campaigns that have posted videos of people threatening the candidate so I can't make a judgement call about enforcement consistency.