If you follow the theory of evolution, genetics is the system by which an environment modifies a species. Some people think it's the other way around for some reason, but the truth is that genetics simply provides options for survival in an unpredictable future, an unpredictable environment, an unpredictable society. And our environment, natural or otherwise, culls who cannot survive.
And we've modified our environment. We've added other issues that cull those that cannot survive. We've created economies, and economies aren't good or evil. They just add some spin to the whole 'who gets to survive' issue. Those that are have more economic power have more healthy food available, have better shelter, and yes - better opportunities. It doesn't mean that these guarantee survival but they most certainly help with increasing the potential of survival. So, in our own way, we cull those that can't achieve a certain level of socioeconomic standing by assuring that they (or, we) don't get as good food, as good exercise, as good so on and so forth.
Some people feel bad about that and donate to make their own guilt go away. Famous people like that are sometimes called philanthropists. Maybe they grow enough to see some potential in the downtrodden, but since economic wealth flows up more than down the downtrodden are necessary for accumulating such vast amounts of wealth. The theory may be different but the practice is close to that.
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