Earlier quoted context omitted.
The USA has a lot of room to improve for sure. But solutions that work for Finland, which is a small, ethnically homogeneous, high trust society, simply won't map to the USA which is the opposite of all those things.
It won't map because of our national obsession with crime and punishment . I'd bet dollars to donuts that it's far cheaper to put a drunk in a homeless shelter AND give him treatment (AlAnon, etc) than it is to lock him in a cage with a herd of sociopaths. But the Prison Industrial Complex has got to look out for its own, after all.
I agree with everything you said except for this. The idea that many/most/all prisoners are violent or sociopathic is a myth propagated by those who stand to benefit from the prison industrial complex. Prisoners are human and prisons are inhumane. For another take, here's the IWW IWOC[0]:
> Incarcerated people are legally slaves as per the 13th Amendment which abolished "slavery and involuntary servitude, except as punishment for a crime". We are legally slaves. If you've been to prison you'd know we are treated like slaves. Billions are made annually off our backs. Outrageously priced or grossly inadequate privatized 'services' like health care, food, phone calls, assault our humanity - they feed us like animals, suck our families dry, and when sick leave us to die. The government spends as much as an elite college tuition per person to keep each of us incarcerated, but this money does not develop us as human beings, reduce crime or make our communities safer.