Part of it is a sort of pascals wager being done, where it becomes rational and logical to play this game as it is for yourself however unsavory, because the incentives for playing it as such are high enough where people will always do it. Altruism towards the collective species fundamentally takes a backseat for individual and kin survival. There are plenty of species where the mother will even eat any offspring who don’t flee them after birth soon enough because the incentives for the mother even out way that small affordance of altruism to kin. Biology is about entropy not emotions at the end of the day.