> If the US were providing adequately for its victims, the Middle East taking in their fellow Muslims, and China showing some semblance of humanity in offering a home to some, we wouldn't be seeing the rise of nationalism in Europe that we now are.

I don't think you can pin the rise of nationalism solely on migration - non-European countries are also experiencing sharp increase in (right-wing) nationalism - including the US which you noted hasn't bourne the social cost.

My pet theory is that nationalism is on rise due to economic frustration post-great recession, as well as a loss of social memory on how awful war is. I remember reading that the big wars tend to happen every 3 generation - I bet nationalist sentiment would closely track that, and our last big war was WWII