If you meant Yudkowsky and co. are doing the aggressive dismantling wrong, or aren't dismantling their own views aggressively enough - that's fair, I have zero knowledge on the subject and would love to hear more. But if you mean that aggressive dismantling is wrong in and of itself, I think it's totally fair to bring Socrates and Rousseau into the discussion.
The socratic dialogues and enlightenment debates are generally taken up by engaged participants (else the dialogues would be quite short eh?) and aim at the idea of revealing truth through questions, or tackling fundamentally interesting ideas.
The dialogues in HPMOR are most often "you're so, so wrong because your mind is defective and clouded by this list of 30 erroneous thinking patterns. Let me elaborate for 10 minutes about why you're a blind fool and I'm a genius who sees the truth".
The pattern is very different and I think characterising what's done in HPMOR, and what's in greek or enlightenment philosophy is a bad idea.
There are good rationalist writers but Yudkowsky is not the one to look at.
I'm pretty sure Yudkowsky aims at revealing truth through questions and tackling interesting ideas too, at least in his head. Maybe his questions are wrong or his idea of interesting is wrong, and that would be a valid criticism, but it's a completely different argument than that he shouldn't be asking any questions in the first place.
As far as I know, HPMOR is meant to be a parody, not a serious discourse. It's unfair to judge it like a serious discourse. His blog posts, sure, we should judge them by the serious standards, because AFAIK they're absolutely serious.