Do you have any evidence of this? Studies often suggest otherwise, e.g. https://www.sciencedirect.com/science/article/abs/pii/002210...
There are so many problems with censorship, but here are two examples:
1) At a really high level, bad ideas don't hold up well under scrutiny, and censorship literally takes away scrutiny. If you want to weaken the spread of a dumb idea, make its advocates defend it publicly. The most insane and backwards ideas can be made to sound somewhat reasonable in an echo chamber.
2) The quotes around "bad" were a nod to the shifting definition of what is bad. Censorship is appealing when the thing to censor is extreme, but it's a power that is too easily abused. You start off with noble ideas of e.g. censoring "hate" but suddenly realize that that's impossible to define well, and so just about anything can be construed as hateful and, by extension, censorable. Censorship just becomes a cudgel wielded by whoever is currently in power.