Me liking printed books more than ebooks is already a political matter, so... that would be difficult to offer political-free content.
I think I already mentioned it, but my idea would be to have nothing for newcomers (so they don't get to see even a single political, or low effort post) beside a few tags/keywords/categories they could click in order to start having content displayed in their feed that they actually want to see, no matter how good or how bad it would be ;)
edit: typos