Well you don't have to like somebody to help them. Their generosity could be born from a sense of duty or even superiority.
Also the irony of Vault-Tec being so assmad about Shady Sands getting in the way of Vault-Tec rebuilding the world despite the NCR being founded by people from Vault 15...
Sure my EVIL schemes have rendered my sums of material and fiat wealth completely useless. Because I will use Human Suffering as the currency now! See the biggest investment of this new capital was the war itself because despite having all the money, wealth and power with no government...
Reading all this makes me remember why I never finished this game. If I ever do get around doing another run, I'm going the route that doesn't have me doing a bunch of community bullshit because that is even more busy work.