The problem is, that it doesn’t even have to be “evil”. Most people make assumptions. If you notice or suspect a question carrying an assumption, I think it’s the right thing to clear things up. A yes or no is simply not enough if the whole premise of the question might be flawed.
That always makes me angry in court scenes in TV, although there it’s likely intentional and therefore your mentioned “evil question”. I hope that shit doesn’t fly in real courtrooms.
It wasn’t worse to begin with. I just wanted to add that this doesn’t have to be intentional and can still happen, due to bias or whatever.