Well, we all have our own problems and we can't pay attention to everything. There are lots of injustices being done in the world that don't come to our attention at all or, if they do, only as a momentary blip, before we're back to worrying about our own problems - which billions of other people are paying no attention to. When something becomes our issue, of course we pay more attention to it. We may look deeper into it and realize the problem is much bigger than we'd realized. When it becomes an issue for enough people, things can change.