Probably for the same reason they are Schrodinger's White.

They can be successful and do just fine on average, unlike any other minority group. Heck most of them have home countries that are doing just fine. But at the same time, there is still that inkling of victimhood because they aren't actually White.

So it creates a lot of wierd complexes in a lot of them about their position in society. They are too successful to be anything but the bottom of Leftist politics, and they are too not-White to really fit in with most Right-wing politics in the West.