Even granting your argument, the dangers of giving any political faction the power to censor political speech that threatens their grip on power will far outweigh the danger of not being able to use censorship to filter misinformation in my estimation.

If countering political misinformation with political information is hard, then public-minded individuals can increase their efforts 5 fold, to make up for the additional difficulty.

This, to me, seems far less costly than the risk-adjusted cost of introducing a new norm of society being more tolerant of censorship.