You’ll often encounter doomsday rhetoric in alt-right online communities: that’s because many of them instinctively feel that once large enough and ethnically distinct enough groups are brought together, they will inevitably come to blows. In short, they doubt that full “integration” is ever possible. If it is, it won’t be successful in the “kumbaya” sense. Border walls are a much safer option.
– Allum Bokhari and Milo Yiannopoulos, Breitbart.com, March 26, 2016