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'So, for example, many of the homeless are on the streets because liberals thought it wrong to keep the mentally ill in live-in psychiatric facilities."
That is a problem of both liberals and conservatives. Liberals keep families and counselors out of decisions for people with psychiatric problems. However is liberals, not conservatives who push to fund programs both drug treatment, and psyhchaitric treatment. Conservative rather incarcerate than deal with treatment. It was Reagan who did away with funding for outpatient psychiatric housing and treatment care funding. Most medical plans cover psychiatric drugs, but not psychologist or therapy. Drugs without therapy and monitoring does not work.
I do agree people should be able to be committed in some circumstances. After 18 the patient has total control, and many do not have the ability to make these decisions.