Well, I'm trying to address it within my limits and my understanding and what my conscience allows. The principle is one thing, the circumstances are different! I conceded (and have insisted) that the US government's foreign policy has greatly contributed to the current state of affairs. It absolutely has. But, I'm also motivated by practical variables, too. It reminds me of De Palma's Scarface. How many Tony Montana's are coming in on this train? If I'm the priest who is confronted with taking-in a recently-paroled Jean Valjean into my home, then the consequences and circumstances are a bit different from what is being posed in this scenario. Maybe the principles ARE the same, but it's not as simple - for ME- to act on them the same way. Other people may die or be injured, not just me.This is the curse of living in a (more or less) democratic society. Our government acts in our name. Even if we voted for Jill Stein or Bob Barr, we are complicit. Even if we refused to vote, we are complicit. That's the nature of our compact. It's like a credit card agreement: if you choose to exercise your citizenship, you agree to its terms.
Hard for me to imagine that you disagree with this principle.
Similarly, it's hard for me to imaging that you disagree that the US played a big role in creating these refugees. Not that we did it all by ourselves. But we played a part - both in the destabilization of Syria and in the formation of ISIS. And we just keep upping the ante.
So the only question I have is if you think we have any moral obligation to help those we harmed. And, again, it's hard for me to imagine you shirking that responsibility even if, like me, you opposed the policies that got us here.