In my humble opinion, people just don't give a fuck if it hurts someone else, so long as they do not know or care about that person, and that there is a sufficient degree of separation. For example, I eat meat. Eating meat is horribly wasteful, because a cow converts less than 20% of the energy feed to it, in terms of corn, into delicious meat. And in addition, it takes around 4900 pounds of oil to make that cow (based on rough calculations of the volume of oil per barrel and and density of oil, and the barrels of oil that go into a cow according to a times article I was forced to read over the summer, which was something like 576 barrels).
All of that means that by eating meat, and trust me my family eats enough meat to amount to at least one cow a year, I am wasting so much food and oil that I could save the lives of many people by switching to a vegetarian diet(for my entire family, maybe 10, just by the food alone, not even counting the effect the oil could have) .
But good damn it I love my meat and those people can go to hell. Now, it is my choices that are causing those people to die, and I know it, but I still do not care. And I think no one would care, because you do not have to strangle them with your own two hands.
If everyone who read this became vegetarian, we could save an entire damn village, but that just ain't goin to happen now is it?
In fact my damn eating habits probably kill far more people than the two 3 iPhones my family bought this year, and probably wasted far more reasources, since most of the iPhone can be recycled, so that only a small amount of material and energy is lost, but that oil and those people and that cow are gone forever.