Whether or not people have that right outside the US doesn't mean it's our problem to enforce that right. Those people have their own countries, with their own governments organized for their benefit.

As an immigrant, this is one of those things that still perplexes me about Americans despite my having grown up here. Nobody in Bangladesh thinks they should care as much about people in Africa as they do about their own neighbors. I see that attitude in the US, but it seems to mostly be an excuse not to really care about anybody except at the most diffuse level.