Earlier quoted context omitted.
I don't know what it is in US culture and society that makes it so hostile towards anyone and anything even vaguely suspected of a crime, but this sort of thing is shockingly common, even when dealing with children. Here's another case I encountered a few weeks ago: https://en.wikipedia.org/wiki/Jordan_Brown_case – there are so many things wrong with the entire thing, starting with charging an 11-year old as an adult…
> I don't know what it is in US culture and society that makes it so hostile towards anyone and anything even vaguely suspected of a crime, In a lot of cases I think it's a proxy for racism. I think there's also a tendency towards black and white thinking, where people are either good or bad, and they're very willing to bucket people as bad rather than considering shades of gray or that authorities did something wron…
I don't have the impression the other factors you mention are unique to the US; people from all types of backgrounds seem to have problems with black/white thinking. This sort of thing seems innate to the human condition.
So the question remains, what is so special about the US? I don't really have a good answer to this. "Puritanism", as another commenter offered, seems too simplistic, and the US isn't the only country with a history of that sort of thing, either. Same with "war on drugs", another popular answer. Drugs are illegal (and sometimes heavily persecuted) in many countries. Maybe it's a bit worse in the US, but it's not unique to the US.
Maybe there just isn't a good/clear reason, and it's just "how the chips fell". The Aztecs went to war for no other reason than to capture people so they could rip out their hearts for sacrifice. There have been cultures where cannibalism of slaves, even child slaves, was socially acceptable for no other reason than "it tastes good". Why were these cultures like this? Who can tell... Probably a complex interaction between various factors.