Earlier quoted context omitted.
“non-rulebreaking” implies that there are rules stating that certain ideas are not allowed.
No it doesn't. The rules can be based around the effort, structure, and tone of your comments. Not the ideas expressed within them. I think the only "idea" not allowed is asking for violence and I've even seen those allowed.
It isn’t about Republican, Democrat, or Libertarian ideas it’s about their red button talking points. So you can discuss say taxes or abortion as long as you don't bring politics into it or get repetitive.
What most often confuses people is you can get heavily downvoted or upvoted for expressing the same idea depending on who shows up to a given discussion about say Nuclear power, Bitcoin, etc.