I wish I had words to describe how really bad and unacceptable ad hominem argumentation is. I've written thousands of them, but seemingly to no effect. Even persons who seem genuinely good in intention and most of their actions do this absolutely unacceptable thing and see nothing wrong with it - which is, right there, proof of *why* judging "this is a good person/this is a bad person" is not a good way to evaluate ideas or actions.