It is kinda tricky. While i could see it as a possible instance of ad hominem in some cases, would it really count as a personal attack to say that someone who

It is kinda tricky. While i could see it as a possible instance of ad hominem in some cases, would it really count as a personal attack to say that someone who talks a lot of zany ideas might be doing that due to a lot of documented brain damage (concussions) in their past? I dont think this specifically would count as an ad hominem, given the “personal attack” (lots of concussions in the past) is directly relevant to the current criticism and is a very probable source of their crazy illogical statements and opinions. EDIT: just fyi, I didn’t downvote your comment. I think your question is very relevant and is in good faith. It is a shame that some people ganged up on your comment, because it seems genuine.