There are a lot of layers here; I’ll do my best to unpack things as I see them.
First, violence by police is always worse than violence by civilians, full stop. They took an oath to protect and serve their communities in a job they knew could be dangerous, so they are obligated to go above and beyond in preventing violence and deescalating conflict. If necessary, they must be willing to suffer physical trauma in order for civilians to be safe. This is an axiomatic belief for me; if you can’t meet me on it, we’re going to have to agree to disagree.
I think everyone recognizes that the protests have caused far more violence than the murder of George Floyd alone. But the best way to prevent further violence would have been to immediately arrest the officers (as any civilian would have been) and hold them accountable. As it stands now, the other three officers who helped restrain him and prevent bystander intervention have not even been arrested. It seems to me that police and politicians across the country are willing to accept thousands of arrests, thousands more injuries and millions of dollars worth of property damage all to protect four officers who should absolutely face trial.
That brings me to “acceptable” and “unacceptable” rioting. There are no doubt people using the protests as cover to sow chaos, or to do “riot tourism” — we’ve all seen videos of that. That is not okay. But plenty of rioting is happening because a group of people have been crying out in every which way that they are drowning and nothing seems to help. I’ve seen even staunch conservatives acknowledge that Floyd’s death was beyond the pale. And it’s not just him: it’s Breonna Taylor, Ahmaud Arbery, and so many others. And those are just the deaths that make the news — that’s a small subset of all the times when someone was “just” beat up, or profiled, or arrested for no good reason. Plenty of black people feel that society is not honoring its contract with them; given that, can we really blame those protesting for feeling that they don’t need to honor their contract with society?