It's hard for me to accept such a final "No" when there seems to be a sub for literally every viewpoint. However, I am willing to accept that those subs get brigaded and maybe that's what you're referring to?
As if there would be more and less popular opinions among the general population? Like, I would be surprised if r/clojure had more subscribers than a gaming sub.
Then try /r/libertarianuncensored or /r/libertarian_party or make your own sub that follows your own leanings. This idea that you straight up can't find a community that has whatever particular leaning you're looking for doesn't seem very accurate.
It's hard for me to accept such a final "No" when there seems to be a sub for literally every viewpoint. However, I am willing to accept that those subs get brigaded and maybe that's what you're referring to?