But he didn't die at home. He died under the knee of Chauvin.
I was only following regulations is up there with a Nazi saying, "I was only following orders!" You are supposed to have the judgement to realize when something is wrong. When the man is screaming, "I can't breathe" and begging for his mother, and you keep putting your knee on his neck until he shuts up, then you are doing it wrong.
Pretty much the same opinion I would have of a psycho nurse who smothered a person at a Hospice. It didn't matter that he had underlying health conditions. Chauvin used excessive force and his three buddies stood around and let him do it.
And his defense had the opportunity to challenge that. They failed to do so, at least not effectively.