I didn't ban them, and whichever mod did, I support them fully. See Well-Kept Gardens Die By Pacifism.
We need the following features on LW:
1) Banned comments no longer appear on user pages. Otherwise spammers have a motive to spam in order to steal pagerank.
2) When a comment is banned or goes to say -4 or below, but not when that comment is deleted, subcomments of it no longer appear in the Recent Comments feed. This will help ensure that stupid discussions ACTUALLY GET PRUNED rather than going on forever.
3) Automatic warning when a user posts a comment falling under 2.
4) Automatic warning when a user tries to delete a comment that already has subcomments, which people seem to do by accident a lot.
A brief line from this comment indicates that the author of the cryonics-critical comment quoted here was perhaps not the one that deleted it.
Was it deleted by a moderator?
Honestly, the decisive downvoting seemed to do the trick of hiding it from casual readers who don't want to see the long annoying rants. I don't think it was casting any doubt on the credibility of cryonics.
While it sounds like the author regrets posting it, I would think they should be allowed to delete it themselves.
Edit: Originally titled "Cryonics critical comment deleted?"