You don't not restrain a criminal with a record while he's resisting arrest and you're surrounded by an angry mob hurling insults at you. Witnesses have already testified to that. In fact, one noted that the police could have tasered Floyd toward the beginning of their interaction. I'm pretty sure that wouldn't have been helpful either.

You're coming at this as if the police knew then what we know now. They did not and could not have. We have the advantage of hindsight and no reasonable trained police officer in that particular situation would have done anything differently.