There is nothing wrong to say WTF and try to persuade the interlocutor that their idea is wrong. You can also argue that some ideas are not only wrong but if be

There is nothing wrong to say WTF and try to persuade the interlocutor that their idea is wrong. You can also argue that some ideas are not only wrong but if believed can lead to antisocial behaviors etc etc. But unfortunately very often people don't have the patience to do this with a civil discussion and instead they cut the discussion short by just painting the interlocutor as somebody who must be a monster to even bring up such a topic in the first place. And I understand why that's the case. Sometimes (often?) that's actually true. Sometimes we're just tired of bullshit flooding and rebuttal asymmetry. But often I just think we're shutting down interesting explorations and we're ill-equipped as a society to have discussions which are truly hypothetical and neutral genuine devil-advocacy. Probably we're so much used to the abuse of those genuine techniques by people who just want to flood the scene with true bullshit.