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.
Even if he dislikes Putin, this may be a virtue signal to avoid being the target of the recent growing anti-Russian sentiment in western countries. Some muslims did similar things to avoid the racism after 9/11 and during the Iraq war.