This is a good point. Censorship-resistance sounds good in theory, but when you actually think about it there is certain stuff that everybody would agree needs to be censored.
When you actually think of it, it's impossible to design systems that are capable of such "good" censorship without also being open to all the other kind. Experience has also shown that, when such capacity exists, its use expands over time. And some of us have decided that the long-term social damage from that far exceeds the damage from any information that could be effectively censored.