I think the OP wants us to say to talk to the person. Otherwise maybe we don’t know.
I believe you LU. Maybe other posters didn’t say that because it’s obvious and doesn’t need to be said.
But the whole group mentality in psychology and sociology finds that when one person walks by then others think it’s okay. They feel less personally responsible to do something when others are around.
When I drive by or see something, like an accident on the highway without any responders on the scene or sirens in view or hearing distance, I call 911 even when there are other cars driving by.
The other examples are when I heard what sounded like a child in the other neighborhood screaming his lungs out (Turned out to be mating raccoons! Didn’t sound the same as a cat fight.), what looked like a barn on fire in a rural area (dunno what happened), a car accident with a solo passenger, and that’s what I remember off the top of my head.
Btw. I recently learned that you can call 211 to get help for someone who is homeless. Ask them to refer you to a homeless outreach program/shelter in the same county as the person. Even when someone has a sign looking for money, he or she may eventually respond to help if approached by peer professionals.
This is a super chessed imho