I propose it's highly unlikely that a person who is living on streets is doing so simply because they are lazy.

Imagine freezing in the winter or sweating in the summer. How about worrying about finding food or how to be safe from unstable people, maybe even well off people who attack/kill the homeless. Your claim is that this is a choice out of a laziness and not a mental disorder or an inability to get a job outside of their control.

That's insane