In a few cases, people interacting with apparently-homeless people have been placed at risk when the man suddenly goes aggressive or overly expressive, and it makes for intense situation people don't want to experience.
Not often, but often enough.
In one case in the west, a cop administering an emergency injection to prevent an overdose was killed by the person she was working to save, stabbed in the chest.
Humans profile as a safety measure. We make assessments in three seconds and it's just evolution that mangled us like that. I think that's what so many people did here, and it's difficult to fault them as this article seems to mean us to do.