Consider you were asked in a public setting whether you've ever fantasized about killing someone. Asked in an insistent manner. Dodge this!

The easiest way is to go meta. Ask the other person why they asked the question. If a person asks a question that's inappropriate to ask in public you can put the burden to come up with a good answer on them.

It's generally high status behavior not to directly answer question whether you engaged in bad activity X but punish the person who asks the question for asserting that you might be a person who engages in bad activity X but making them justify their bad faith in yourself.