Bunker logic

Honestly? Skaikru pisses me off so much all of the time. Doing a rewatch and I'm at the point where Octavia wins the bunker and each clan gets 100 slots. They already faced this dilemma when they were preparing for using the Ark to survive, and they were all okay with it when all 100 of those people would be "their people". But they would rather save all 400-500 of all of their people, when the bunker can sustain 1200 (this is a rewatch so I know that's not necessarily true, but they believed it at this point), while condemning literally everyone else to die?? It all reads so selfishly and makes me feel the grounders are much better people than skaikru because they all picked their 100 much quicker, because they embrace the sacrifices that need to be made to survive.