I haven't read this entire thread but wanted to add my two cents to the discussion. I agree that letting mentally ill people live in society freely was a mistake, from day one. We sure haven't done society or the mentally ill any favors by doing this. Now our prisons and jails are filled with people who have reached their final destination - a place that is not equipped or funded to help them. They're unhappy and society bears the huge cost of incarceration and police resources. It's a sad situation with no easy solutions unfortunately - believing people who are very sick are gonna be able to medicate themselves and somehow survive in the world is a total fairytale fantasy, imo.
It's actually even a bit worse than that.
I can think of several homeless/mentally challenged people that we deal with that fit the following.
Out on the streets acting crazy in one of our cities.
City cops pick them up on some minor city charge, instead of a state charge (I'll explain the important distinction below). Be that for 'stats' or for being seen to 'clean up the streets'
In their unmedicated state they come to jail and are usually hard to deal with, now putting my officers at risk every time we have to put hands on them.
Most of them will end up on their medications and aren't a problem from there on out. Problem is, being city charges, they're released fairly quickly, usually within a couple of weeks.
Back out on the streets after a few weeks and just barely through detox or to the point their medications take effect, in a couple of weeks, they offend again and the process repeats. That particular 'city' system isn't even set up to better the person in any way, but the towns/cities like to tell their citizens that they're doing a good job. After enough of these trips, they might be sentenced to a couple of months, but that is still without mandated mental treatments, although they generally will be detoxed by the time they get out.
Every single trip to jail is more time, more money, and more resources involved. Especially since they have to go through the whole health intake process every time, which involves being seen by the jail health people. Far more work than if the person was just in jail for the whole 6 months rather than 6 separate trips in and out.
---City vs State Charges---
Cities, can't, won't, or don't sentence people to rehab or some form of mental health treatment. They usually only impose a fine and some minor jail time and they're back out on the street. State courts have more power to mandate mental/drug treatment, or at least offer options to the people.