Here in Queensland, Australia, we have a young child who died after being seen by 21 Child Safety officers, with a Coronial Inquest saying the Child Safety Department failed the child in just about every way possible. Now social workers join such departments because they care about people - so how is it at all possible that 21...yes 21 child safety officers looked into the the case and failed the child?
Why is that at all relevant? Because to me it speaks of the same type of underlying problems that lead to the death of George Floyd - systematic problems. The culture of all large organisations tends to follow its reward structure (which includes workloads & what impacts workloads, rewards, incentives, promotion system, discipline, what causes them the most problems from management etc) - and 21 safety officers failing a child speaks of them being deterred from doing their job by the reward structure.
Did the officer on his neck mean to kill him? I doubt it - he didn't have a look of hatred or any such intent on his face while he was kneeling on his neck - but he should face at the very least a manslaughter charge (positional asphyxiation is a well enough known phenomena, and even if it wasn't known by the officer on his neck or the others - a man telling you he can't breathe while handcuffed and offering little to no resistance can be handled in a much, much safer manner). But I also don't doubt that the system, which tolerated 19 complaints of excessive force, didn't serve either the officer (the on on the victims neck), nor the victim. Likely there is also a culture within police forces of 'us against them', and likely such is both tolerated, and just as likely there is little psychological support to help prevent it. Just as likely there are other systematic issues behind this.
That said, everyone is responsible for their decisions, and it seem to me he should at least face manslaughter charges. I really don't see how murder would get up.