Yeah, that is a great mental heuristic: the majority is always fair and right. I am sure the Jews thought that back in 1930’s Germany. And the Christians in Rome, the Kolacks in Russia, the intellectuals in Mao's China, the wealthy Cubans when Castro took over and blacks in the US before the civil rights movement.
You grant too much. The people who are making these deplatforming decisions do not represent a majority or anything close to it. Perhaps they believe they will when their cultural revolution is complete and the dust has settled, but that has yet to be seen.
The equivalence is not in the persecution but on the validity of an heuristic that that dictates you are an asshole if a powerful majority says you are.