The problems of other countries ARE ours when our policies of intervention help create them, even when it's a matter of sanctions helping to impoverish the civilian population of a given country.  When it's our military destroying lives, public infrastructure, and leaving nothing but power vacuums and political chaos in our wake, refugees from that region are unquestionably our problem.

America traded in its "greatness" by trying to maintain itself as the world's foremost military superpower:  Our resources went from maintaining healthy schools and infrastructure to maintaining a worldwide military presence after WW 2---At a cost which, like the growing refugee crisis, many on the "right" would conveniently like to forget.