He didn't kill himself. He was killed by being locked in a van, shackled, and not buckled.
Certainly he is responsible for the actions that necessitated him being placed in custody. Once he was in custody, his safety was in the hands of the government. Now, we're not talking some unforeseeable thing like an earthquake or sink hole killing him. We're not talking a fire in a cell that wouldn't unlock when all maintenance was up to date. We're not talking about him being shot in the back. He was in a vehicle operated by the government. He was shackled by the government. He was NOT buckled in by the government. By not being buckled in, his safety was reduced unnecessarily. No herculean effort was required, no special skill, no new equipment needs installed - hell, even the procedure does not need to be changed. Simple and routine steps needed to be taken to help ensure his safety that were intentionally not taken.
Had they forgotten, that's a sad thing. If they remembered and the belt broke, that's a sad thing. They intentionally, negligently chose to put his safety at higher risk, and the result is a citizen is dead.
Again, I see no intention to kill him. I see no racism involved. I see no evil-doers. I see negligent government in terms of maintaining the safety of the citizen in their charge.
You can blame the victim if that helps you. You can see him as a POS, and therefore his life is no loss to society. But, if your actions with the police are deemed by them to make you a POS, are you ok with dying through their negligence? If they pick your grandchild up, are you okay with them not buckling him into their seat?
I'm not.
Nothing has changed the basic facts here. A citizen is dead and doesn't have to be. That citizen was in the custody of the government, and the government failed to follow their own procedure and simple, common actions taken by most any reasonable person for their own safety. Because of this failure, he's dead. And, no one takes or demands responsibility for that. I find that sad.