Saying "the Rebellion becomes an Empire" implies that the side that fought against the bad things starts to do equally bad things once it gets into power.

Homosexuality was punishable by death in England up until 1861. Women didn't have the right to vote in France until 1945. Progressive extremists get people fired, and can even commit violent crimes sometimes, but they're nowhere near as bad as the state-approved violence that the minorities they defend were historically subject to (and still are in some countries).

Writing a transphobic tweet can get you fired, and I agree that's bad. Being transgender can get you killed. Saying "the rebellion becomes an empire, we need a new rebellion against them" is incredibly dismissive of the abuse marginalized groups go through.