It's not a weird circular logic. You are implying that its black and white between restraining vs not restraining. There are levels of restraint.
He was almost certainly a very annoying and difficult subject to restrain. He needed restraining. Once someone is in hand cuffs and there are 4 of you, you do not need 1 of the 4 to kneel on his neck.
Do you feel someone who has gone unconscious, who is in handcuffs, needs restraining with a knee on the neck?
I would never place a knee on someone's neck to restrain them full stop, never mind after they have gone unconscious, its asking for trouble, the only way to achieve that position is to have someone already restrained and to do it to exert extra pressure. That pressure could easily be done with a knee on the back of their legs.
I'm not implying that, I acknowledge that there's different levels of restraint but that any specific individual is either sufficiently restrained or they're not. If it required 3 people to hold him down which is not at all unusual for someone of his size and build, then you can't just let go and rely on hopes and prayers that he'll continue to comply.
Someone who is unconscious does not need a knee on the neck no. However in the real world where perpetrators sometimes feign compliance so that arresting officers are more lenient on them use this as an opportunity to fight back, to flee, destroy evidence etc. In a real world scenario it's much harder to asses if someone is genuinely unconscious, or having a heart attack or whatever, especially if it's unusual for that kind of thing to happen. This is kind of privileged position from someone in a comfy chair watching a video recording with 2020 perfect hindsight that he ended up dead and couldof-shouldof-wouldof all day long. That's just not how arrests happen in real life, people fight dirty, they bite, spit, they go into fight or flight mode, adrenalin kicks in and people are temporarily much stronger, they might have hidden weapons or handcuf keys, they can become extremely aggressive, hostile and unpredictable and law enforcement are taught to not take any chances. If a level of force was required to subdue him then it was maintained until backup arrived. That's both sensible and consistent.
You could kneel on someones legs and if there was a broken piece of glass or another sharp object under that persons legs you could force it into their leg and sever an artery killing them. There's always risk of harm and death with any physical altercation. Hell, people tackled to the ground can crack their heads open and died in minutes. The question isn't about perfectly 100% safe methods it's about methods that meet some reasonable level of standard of safety. These kind of choke holds aren't killing a lot of people, their deadlyness is way overblown and so again it's nothing at all to do with the method it's just the emotional reaction that people have when they see a white man with his knee on a black mans neck.
I'm in my last year of a Ph.D in Computer Science.
So yeah, I'm familiar with statistical tests.
It's not about statistical tests per se, it's about data analysis. You can't always just compare 2 data sets side by side, sometimes you need to control for relevant factors. So for example maybe you want to look at Corona deaths in the UK vs the US, ok well the countries have different sized populations so you'd expect different death counts, in which case you control for population size, and a number of other factors if your analysis is sophistocated. And if you want to compare say arrest rates of 2 different populations you'd control for criminality, maybe one neighbourhood has more or less criminals than another neighbourhood so you'd expect more crime there and thus more arrests.
Controlling the US crime statistics for race is really easy because there's good data on it and it's all made publicly available. It's also relatively non controversial among the professionals who do such things, such as experts in law enforcement and criminology. But again the people that push this stuff and whip up the nation into a frenzy over racism do not care one iota about the actual data on this, no one REALLY cares about how deadly choke holds are, that's justification AFTER the fact. That's them getting emotional about one thing they've had shoved in their face over and over and over again, and then justifying their unique and specific anger post-hoc. And you can tell this easily because you mention something else that's significantly more deadly and they don't care at all.