Millions of people are probably dying every day, but none moves us unless it's close to us; millions of animals are sacrificed around the world to feed us, but we don't care.
I've thought about this often. A movement (fighting cancer, drunk driving, quadriplegia, etc) only matters to us once we, or someone we are close to, is affected by it. The cow, pig or chicken we just slaughtered for dinner could have easily been a close pet, had we adopted it as such.
We get too tied to relationships, jobs, colleagues, places, cultures, even god damn auto vehicles.
This is a tough one. If we avoid attachment entirely, then our relationships, nationality, and careers will all be superficial, allowing us to let go in an instant. Is that not an empty existence? But if we allow ourselves to get attached, then our opportunities to explore and experience will be limited.
I tend to lean more towards the Buddhist philosophy of letting everything flow through you, instead of clinging to it, but it's always a balancing act.
RE: Attachment: The Bitter Poison