The way this sounds is that you are more concerned about politics as in people who take party positions and may feel excluded as a group when the majority of the community takes a different position. This is a slightly different issue i.e. party politics, and I think it is fine/a good thing, but it is also important to distinguish the two. This should essentially be under the same umbrella as personal attacks, as they are essentially the same thing.
To support your point, there's a press release circulating from Google and Facebook right now. They've launched a program to share hashes (fingerprints) through a database identifying offending ("extremist") content so it can be more efficiently removed from the web. Yet, we aren't allowed to comment on this - I just posted it and the story was flagged.
There's a huge difference between saying "No more gratuitous flamebait about the US Election", and "no technical discussion permitted about any topic that could possibly be controversial."