They probably do in places which suffered from it (Ukraine).
America was not the first or last European colony. Mexico was a colony, Brazil was a colony with even worse racism -bad things happened and continue to happen everywhere. Slave trade continues in the middle east. Today. Read up on what Latin American colonies did to the native populations. It's not different. They didn't have confederates.
I don't see how any of that should subjugate free speech.
Murderers have free speech --I'll wager more than a few victim's families wish they did not. I believe they should still have that right.
Should we go to Japan and also try to shut down the speech of those still in support of the imperial campaign in China, one of the most atrocious incidents of all of WWii?