You're only looking at the gained education for the 95% and the lost education for the 5%, not at the social cost of some of the already disengaged 5% ending up

You're only looking at the gained education for the 95% and the lost education for the 5%, not at the social cost of some of the already disengaged 5% ending up in jail for armed robbery or murder. Again, it all depends on where the 5% end up. You're not allowed to take them out back and shoot them like an aggressive dog, so are you going to look after them and give them some kind of a future, or are you going to throw kids out onto the street to grow up into career criminals?