> There is no harm done by answering a bad faith question in good faith.
That is the primary misconception which is exploited by the sealion tactic. It allows a bad-faith individual to reverse the position of offender and victim - because what harm is there in just asking a good-faith question?
Questions are still part of an argument, they are "leading" the reader. And addressing it carries the implication that it's a valid position worthy of respect and time to address it.
And some questions can be very noxious indeed and do need to be stifled outright - "what good has [minority group] ever done for us" is quite a harmful question even if the answer is legitimately "lots"! And again, even merely by bringing it up, and by addressing it in response, you've given it legitimacy both as a question around that particular group, and to the idea that groups need to justify their existence/presence in society. Those are both very harmful things done merely by "answering a bad-faith question in good faith".
Again, perhaps a more core value disagreement is that "good-faith discussion" can legitimately solve all woes, including malicious actors. That is really the basis of your "no harm can be done by answering a bad-faith question in good faith", is it not? That seems like magical thinking to me.
Anyway, "no harm can ever be caused by answering a bad-faith question with a good-faith response" is quite a broad position, perhaps you can cite some evidence or studies on that one, because there's rather trivial examples like hate speech that definitely run against it.