I've never met someone who wouldn't prefer to change the law rather than be forced to violate them. But only cowards and the intellectually incapable think that supporting the enforcement of an unjust law while campaigning for it's fix is someone a morally superior stance.
And to answer why America? Because if we can't do it, nobody can. What kind of yellow-bellied, unpatriotic attitude can you have to think "oh, let's just let some better country solve the problems we've created in the world through prolonged geopolitical control over the 20th century". Fuck that. If America is great enough to conquer the world, it should be great enough to solve the side effects that come with it.
> Also, what makes refugees specifically the US's responsibility? E.g. verifying, processing and integrating refugees puts strain on domestic systems, and strain scales with volume.
I think nobody said it's the U.S responsibility, in spirit. Factually it is by the fact that they have to handle it and international laws. But that is why country sometimes collaborate on those issues. The U.S and Mexico do collaborate on immigration issue. Mexico do stop a lot of south american immigrant from reaching the U.S border. But the border is huge. There is also other ways to get in, legally or illegally. You can't possibly stop everything. And it is the burden you get when you are a rich country. The U.S is not the only one. And mind you, the U.S and Western European country have benefitted a lot from exploiting the people and resources in poor country and pushing allied authoritarian regime there. Immigration is but a small cost they pay for what they did, and got.