darwin
everything is for survival. love, sex, child, work, food, friend, …
it’s very simple: consider in the beginning 99% didn’t give a shit about survival and 1% did. so after some time the first group perishes and only second group remains. that’s why everything is about survival now.
everything we do is for ourselves even the most apparently selfless acts are for our own satisfaction. so how societies are emerged and why they don’t collapse? the answer is win-win interactions. i give my friend sth he needs more than me and he does the same. on the surface it’s called friendship but in the core it’s just everybody striving for their own survive.