Earlier quoted context omitted.
The problem is who decides what's a "bad idea"? Every group has its own list, whether it's Scientology, the CCP, NAMBLA, PITA, etc. What group do you trust with defining your list of "bad ideas"? Historically the "bad idea" list has been generated by whoever rules/controls you. Why do you think it's different this time?
Yes, this is a completely valid question. In this specific case: Do you think it's bad for YouTube to be active in reducing the spread of this information? Because to me it's almost self evident it shouldn't be entertained as a valid idea. I might also ask why you aren't protesting Hacker News having moderators? Content is deleted from this platform all the time.
You don't see the difference between debating whether there should be moderators and debating what those moderators should do?
Nobody is questioning whether YouTube should moderate its platform. We are questioning how they moderate it.