I receive email from Lumosity. Filtering things out is one of the core cognitive skills for doing anything hard.
There's a famous experiment where, if people are counting basketball passes between the players in the white shirts, they don't notice a gorilla beating its chest nearby. So, as people have noticed below, homeless people are not the only ones who get ignored.
I don't know how to make a world which both offers people freedom to allocate their cognitive resources, and reliably notices and responds to suffering.