It's beyond me, to be honest. I think the world can only improve with immigration.
I suppose you could say the same about patriotism. I've always found that strange, especially flag worship. I love Britain, but would happily burn a union jack, just for the hell of it. It wouldn't bother me in the slightest to see it go up in flames. It's just a piece of cloth.
I remember when I was in Canada, when they beat the US in hockey there was some huge scandal because apparently the US team had a Canadian flag in their changing rooms and were stamping on it. My friends were beyond angry about it. So I asked them, what do you care if they're standing on a bit of cloth with a maple leaf on it. "It's what it represents that's important" and they rattled off everything that makes them proud to be Canadian. It was sweet to see them so proud of their country, but I really still didn't get it...