I don't think good sci-fi has ever been grounded in politics. It's always been grounded in ideas, and the politics come from those ideas.
The same is true for the books the Puppies are attacking! Go look at the Hugo winners and nominees from the last few years. Time travel, planet terraforming, alien politics, it's all there. None of them on there are solely about pushing gender politics or racial issues. They are, however, starting to include those views in a discussion about what the future looks like. That is what the Puppies are reacting to.
The very best sci-fi doesn't convey a message so much as pose a question.
That's not really up to you to decide. If you don't like sci-fi written a certain way, don't read it. If others do, and if they give awards based on what they like, so what?
And again, if the Puppies don't like the Hugo winners, they can start their own awards. There are other awards in science fiction, like the Nebula. But they won't, because It's not about a fair, just award system. It's about other people enjoying something they don't like, and trying to take that away from them.
All I'm saying is, the Sad Puppies bring up a fair point that warrants consideration rather than dismissal.
Right, and I'm disagreeing with you, strongly. It's not a fair point. It's an angry point based on a selfish, intolerant worldview.