How exactly is describing reality selfish?
[1] http://thewireless.co.nz/articles/the-pencilsword-on-a-plate
This is not an argument against treating your children well, but the reality is that having parents who are well-off and educated buffers you against all kinds of mistakes and issues that would sink other kids. Moderating (not eliminating, which is neither possible nor desirable) social inequality is important precisely because we can say with as much certainty as we can say anything that there are kids out there today as talented and driven as Bill Gates who don't have anything like the resilient support system that he had, and without it they are likely going to be a drag on society rather than contributors to it.