

They don’t, they reference what they call the “June 4th incident” all the time when relevant. What they don’t allow is spreading the fictionalized version of events, ie tanks running over 10000 protestors in the square. They acknowledge the real events, which were riots around Beijing that were put down by the PLA, resulting in a few dozen deaths of officers and a few hundred rioters killed by the PLA. The west uses the atrocity propaganda of the former story to undermine the socialist project in the PRC.

To build a better world through organizing in real life, and combining that with thorough study of Marxist-Leninist theory. Part of that agenda involves talking to those with misconceptions surrounding socialism and communism, and trying to help correct those misconceptions.
It’s definitely “scary” for right-wingers and the like.