I think you are going to have a hard time convincing someone who only refers to ivermectin as a “horse dewormer” to think of it beyond whatever their summary talking points tell them. That is why the talking point is to try and mislead folks as it being only a veterinary Rx, they don’t have to go into details…just dump the misinfo out there.
BTW, I’m not arguing for or against it for Covid. I am just saying that if my doctor decided to prescribe it for me, I’m going to trust their judgement, because I trust them.