Earlier quoted context omitted.
If people are so irrational that they can't be trusted with judging information, so will be the gatekeepers that will wield the weapons of censorship.
I was talking about whether censorship is effective at preventing the spread of specific ideas. You're talking about whether censorship is a good idea. Separate discussion.
I suspect that the answer is "it depends on the culture". China seems to have a lot more control over the spread of anti-CCP ideas than Iran has over the spread of anti-regime ideas, and it isn't because of Iranian censors trying less or having worse tools. But the Iranian population seems to be much less conforming and more ready to rebel.