I will take on the point of the Starkiller Base: The speech by Hux was enough to get the emotion of the thing. It wasn't emotion on feeling sympathy but it should have worked on that level because it was a heel promo. The look after Hux had destroyed the base was so great. It was like 'Holy shit. We did it! Oh fuck what the shit did I just do?" in one look. Great speech and he was really the movie's MVP for me.
Starkiller Base is named because it steals the energy of a sun to get its weaponry. Once it sucks the power from the sun it fires and the sun dies. Not sure if they saved the sun by destroying the base because there was no reverse button pressed. They might all still die if they don't leave the system.
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