I don't think it has anything to do with how much money people have, but rather if those people experienced difficulty in their life and can sympathize.
It depends. I think more than anything, people in the same socio-economic class tend to be able to emphasize easier with each other, which is why those that are wealthy can't always put themselves in shoes of someone less fortunate than themselves.
If you want an absence of social aggression, for your community to deliver basic human sympathy and empathy, go the the poor people and live as they do.