From my experience, most of it seems to be just people who are looking at their own particular world -- they are not often projecting outwards and looking at a big picture that includes suffering in other parts of the world. And even when people become aware of such suffering, they don't really "get" the depth of it until they see those famine videos and suddenly they break down crying... and even then they're just responding on an emotional level and not automatically seeking to step back, see a big picture, and connect all these dots ("Well, if those people are suffering so unfairly, then why isn't God blessing them, and what does this say about me attributing my own successes to God's blessing?" etc.) This is not an instinctive approach for many people, so what seems obvious to big-picture people is not obvious to those who are not... it's just one of the differences.
Personally, I think an awareness of the world outside one's personal culture and microcosm is part of personal spiritual growth; it gives us a context for our beliefs, otherwise we tend to assume that what we've experienced in our lives up to this point is the same world that everyone else lives in, so then we can come up with some unchecked assumptions/beliefs that are not actually universally true... or misframe our beliefs in some way.
I think the blessing thing is just part of one's attitude that one wants to be grateful to God for what goodness he gives -- it's part of submission to the higher order of things. It might not seem intellectually viable to some people if examined on a large scale, but it was never really meant to be an intellectual conclusion... it's part of submission to higher authority.
