Trump called what happened to Floyd a disgrace. I'm of the opinion that many conservatives agree that Chauvin was wrong for what he did. They just get all uppity because they perceive (like Trump) that everyone on the left thinks every police officer is a "disgrace".
It was indeed the far left that capitalised on Floyd's death to amplify their 'defund/abolish the police' rhetoric. And it is indeed the far left that also thinks we should abolish prisons. (The far left has some extremely ludicrous, destructive, pernicious, insane ideas).
I can also say from personal experience that every single time I've seen ACAB in a bio (not a gender designation at birth but 'all cops are bastards'), it has come from a leftist.
So even though I hardly imagine it was only leftists protesting Floyd's death, the repeated anti-police riots around it were almost certainly coming from actors on the left.