It isn't. It's much more graduated than that. If we don't vary the amount of support people get, then we won't be able to take advantage of situations where mo

It isn't. It's much more graduated than that. If we don't vary the amount of support people get, then we won't be able to take advantage of situations where more support (or less) would result in greater success. And given that everything is constantly changing, there is no way to find a perfect level of opportunity to give to people. So, a system that provides a varying level of support spread out against the population will do better nearly all of the time than one that provides an equal amount to everyone.