It makes me shake my head to see people think of the world as black and white. Rarely does the overthrower act better than the despot. If he is American-supported, we will just stop hearing bad things about him. I've seen the pattern play out way too many times.
Pinochet, for one. US-backed coup d'etat overthrowing a democratically-elected government. For more you can read the Wikipedia article United States involvement in regime change
Lenin - 200k executions, 5 million deaths due to famines
Stalin - 800k executions, 1.7 million deaths in the Gulag, plus some famine and some miscellaneous brings to around 5million, some estimates upwards 20 million.
Not Putin supporter ofc.