It
sounds like the guy had legitimate mental health issues.
https://www.bbc.co.uk/news/world-us-canada-65472810
Unfortunately, I think the efforts to restrain him (while legitimate) were not very skilful.
I can get it, I can imagine a situation where somebody would put someone in a chokehold to stop them, but you'd quickly find another way to restrain them, right?
It's one of those situations were a pair of handcuffs would be far more useful than a chokehold or a gun or anything else, really, but nobody thinks to carry handcuffs.