Here's an NPR article if you doubt.

"A concerted effort to grow community-based care options that were less restrictive grew out of the civil rights movement and a series of scandals due to the lack of oversight in psychiatric care."

Funding is still an issue, as that article acknowledges, but the change seems to been primarily driven by the "well-intentioned" supposition that individuals in long-term care facilities "probably could do well in the community."

Regardless, I'm sure that there would be relatively broad conservative support for "refunding" homeless detention and care facilities. I'm only being a little facetious when I say that "lock them up, throw the book at them" seems like something the right could get behind...