We have that in the UK, some of the poorest areas are council estates, lots of people never have to go onto them and have little to no incite into the lives of the people who live there, I grew up 'poor' (by the standards of the UK, not talking living in a shanty town or anything) and it leaves a mark on your thought processes that never entirely goes away.
Things are getting much worse here, 6 years of austerity has removed many of the services that poor/disabled people rely on gone or in a perilous state but there isn't widespread anger about it because it has dis-proportionally hit the least 'powerful' in our society the hardest.
Frankly I think we are headed down (if not already some way down) a very dark path and I wouldn't blame the people who are hit by this in the slightest for rioting/rebelling.
Society should be about making sure that the poorest members have at least a decent standard of living otherwise what is it for.
I can't change anything. I can't help them. It's not my responsibility. I'm out and I want to put as much distance between myself and that as possible.
I think wealthy "first worlders" tend to be very "aware" of poverty and want to make a difference despite being quite far removed from it.
On the other hand in countries with serious poverty where the middle class live in the same communities as those in desperate poverty there is a lot less focus and sympathy.
Being aware of suffering in the world and living with a minimum of class segregation are orthogonal concepts, or maybe even inversely coupled, with the comforts of segregation helping superficial salon socialist ideas.
But the way I understand the root post (grandparent or deeper), the idea of avoiding the segregated bus is not directly about helping, it is just a routine reminder that the people outside the bus are persons. Maybe with their individual flaws and imperfections, but not the fearsome mass of zombies or orcs that they become in the eyes of those who spend too much time in comfortable isolation. Fear is difficult to get rid of once it is there, but it can be trivial to not allow it to start.
It's horrible future, but a future to come if people dont "want nothing to do with it", it being the very reality that they have diced a 6 on, and somebody lesser fortunate being born beyond the wall has diced a 1 on, only guilty of having another mother and father.
Some say it's a future only distant in the eyes of the rich. I think that is, sadly, very much true.