Oh, you mean that thing that doesn't actually happen naturally?
Natural selection =/= not helping the ones that can't help themselves. AT ALL. Helping members of community is a survival strategy in many species; ants, squirrels, humans.. that allows for the species to survive. Natural selection is not about individuals, but about the species. This isn't some new human thing but an extremely common survival mechanism millions of years old.
Also you're pretty short sighted if you think you can help yourself... good luck trying to make tools and groceries without support from a larger community...
But if you want to justify treating people like shit by short sighted and inaccurate ideas of the way things are supposed to be no matter what I say I can't help you.
Also a large number of your friends and relatives would be dead if you went by your rule of natural selection - ohp, that person has diabetes, well, they can't make medicine for it so fuck them..