As a visitor to the US, I find the homeless there very emotionally saddening.
I had a morning routine in LA where the same guy would greet me and everyone around. I just started buying him breakfast each day and he was always very appreciative. Saw a lot of people grabbing food out of garbage cans. Another guy with no legs crossing 10 lanes of traffic. Just a painful reminder of how much harder life could be.
I wasn't as regular with my routine in SFO and admittedly moved apartments further from the tenderloin. I ended up scaring more homeless whenever I walked through the tenderloin than scared me. But I still found it depressing to have to face that each day when I knew I could make a meaningful difference to many of the people I saw.