In the short-term, you are absolutely right.

That said, a lot of homelessness happens as a result of mental illnesses like drug addiction or schizophrenia, or degenerative diseases like Alzheimers. It might be a pipe dream, but I would like to have as much research as possible to help treat these diseases, to (hopefully) help reduce these issues, perhaps by developing a cheap medication to reduce or eliminate the effects.

It's not something any of us are immune to; any of us could develop Alzheimers when we get older. I'm fortunate enough to have a lot of really cool friends and family that would take care of me if that happened, but not everyone is so lucky.