Maybe. The kind of nationalism that sees immigration not as a leavening and enriching of a country but as thinning out of the purity of race is rising worryingly in both Europe and America (and of course has never ceased in China, Japan and the subcontinent).

And the thing is, because it's creeping in - at first as dog-whistle ideas and symbols (like the Aryan Nation hand signal in the US), and gradually becoming more overt, we think it's harmless. The kind of thing that's said quite commonly about Muslims is identical to what was said about Jews in the 1920s and 1930s; now that it's become acceptable to speak about Muslims like that, it's also becoming acceptable to speak about Jews in the same way.