It sucks but it beats dyin' - they leave from home to the camp because that's where there is to go. Usually there's a grumpy army stopping them going further, say, over a border.

But say you're right. The ones who can conform to the requirements of their destination will make it, and the rest will politely die in place. The result is still a massive movement; we're just arguing about proportions.

And sign in, dammit, anonyposting is annoying! ;)