"Why draw the line at family and friends? It's a natural place to draw the line. I think if you study psychology and the evolution of the human mind that's pretty obvious."

I think if you study those things, you'll realize that it's not at all obvious. Clearly there's a difference between your blood relatives and the rest of humanity, but we collaborate and dependent on non-related strangers far more than any other species, and we have morals that support that kind of behavior. Why, do you think, we accuse people of nepotism, when they favor family in some scenarios (particularly in business and politics)?

I think the slogan "charity begins at home" is not appropriate to excuse one's ignorance of others' plight, and the fact that we have this debate is a good proof that human ethics are, in fact, more sophisticated.