I don't think that these special schools are sorting.
However, their opponents do. They argue that letting kids out of crappy schools makes things worse for the kids who are left by denying them role models or somesuch. This is a curious argument because the kids left behind don't do worse when left behind.
I think that the opponents are wrong. (I'll even go so far as to say that almost all of the kids in the crappy schools would do better in these special schools but when you say that, the opponents figure out that you're accusing them of defending crappy schools.) However, my point is that if they're correct, they owe the "good kids" something for the sacrifice that they're asking them to make.
However, their opponents do. They argue that letting kids out of crappy schools makes things worse for the kids who are left by denying them role models or somesuch. This is a curious argument because the kids left behind don't do worse when left behind.
I think that the opponents are wrong. (I'll even go so far as to say that almost all of the kids in the crappy schools would do better in these special schools but when you say that, the opponents figure out that you're accusing them of defending crappy schools.) However, my point is that if they're correct, they owe the "good kids" something for the sacrifice that they're asking them to make.