If I'm reading these spoilers correctly then Spoiler the Federation is indirectly responsible for stranding Spock in the Kelvin Timeline. If they had continued with evacuation, he wouldn't have needed to risk his life with red matter and the supernova. And Spock himself would have been aware of this. Elderly frail ambassador Spock was the only one who could smuggle in Red Matter from Vulcan and save Romulus. He made an uncharacteristic promise to the Romulans to save them because he felt guilty about the Federation abandoning them. That's how we got the unlikely situation of an old half-Vulcan being the only one trying to save Romulus.