I'm not saying I agree with them, but a common theme I hear from the alt-right is "no gods no masters" (Game of Thrones reference, ding on the pop-culture). Now, nevermind that these guys are setting up as many gatekeeping functions as they tear down; they simply justify it as "protecting real hard-working Americans" through xenophobia.
It's all built on the false nationalism of a flagging superpower, and if any of these people traveled in the least they would see that other countries are actually doing a lot of things better than we do here. We got arrogant, our politicians got greedy, and our voter base got complacent. It's only going to get worse too.