>The push against forced deinstitutionalization was made because of the systematic abuse within that system.
That is a quintessential example of "throw baby with bathwater". You've replaced regulated institutions staffed with credentialed professionals (medical and otherwise) providing safe and structured environment and healthcare, with mentally ill people living in tent-cities and squalor, surrounded by crime, prostitution, abuse and illegal drugs and exposed to the elements.
Tell me again how you've guaranteed 'basic human rights' with your replacement for institutional care? And don't tell me that any problems in the 60s and 70s with institutional care, could not and would not have been improved over time. Instead, the policy to dismantle state and municipal institutional care destroyed countless lives that would have benefited from said care.
>The role of any modern society is to offer people who need it treatment and basic support (and that should include housing, of course), without impeding their basic human rights.
And people who aren't capable of making the best decisions for their lives due to mental illness - how does that factor to your equation of 'basic human rights'?