Second, difficult to help individuals being in the minority will require a very good citation. The difficult to help ones are likely causing the biggest issues - shooting up on street corners and deficating in public.
As for homeless people, you can't tell that someone is homeless just by looking at them. Your personal statistic include only those very visible people who in addition to being homeless have tattered clothes and are incapable of personal hygiene. The majority look like ordinary people.
Furthermore, complaining about the use of “you Americans” is childish tone policing and something one does when they are unable to address the merits of an argument. Maybe if you had an actual argument you could think up something else to share, rather than attempts to stymie discussion because it appears to make you uncomfortable.
Lastly, you brought up nationalism. From my vantage point (as another American) it looks like you’re just trying to shut down debate instead of face the reality of the outcomes we Americans have engineered for our most vulnerable populations.