Censorship of dangerous ideas is already occurring - albeit in an ad-hoc unorganized manner (Twitter, Facebook, Youtube, etc. all remove posts/ban users).
I honestly do not know how best to responsibly censor ideas without infringing on freedom of speech. Yet, I feel that censorship must occur.
In an ideal world, we could form panels of apolitical topical experts to advise or perhaps oversee policy in this regard. Might this be possible in practice? After all, we have judges who ostensibly are apolitical (but in fact are anything but) - but nonetheless, the judicial system in the US stood firm for Democracy - rejecting challenge after challenge brought by Trump and his allies seeking to overturn the legal, fair and honest election of Joe Biden.
And thus - the burden isn't that we find apolitical experts - rather it is that we find experts sworn to uphold truth - and having identified such experts - for example going through congressional vetting after nomination by the sitting President - a panel to oversee dangerous speech/writings/online posts could conceivably be formed. Moreover, it seems to me that formation of such a panel is no more difficult than establishing a functioning judiciary.