In fact, I don't disagree with you. I stated that too, that subs are literally being taken over by either far-right but mostly far-left trolls. I specifically included far-right hijacking to take into account what happened to r/France and r/Canada.
I've seen libertarian folks being hounded out of r/conservative just as much as I've seen centrists being hounded out of r/politics. Not to mention, most comments seem like they were written by people with zero world view, and who haven't gone anywhere beyond a 100 miles from home, regardless of political leanings. Reddit general (I.e. Reddit minus the niche subs), the subs that come on Popular, is basically a diorama of the lowest possible denominator of man.
Not exactly the left's fault if the right on the internet tends to be, you know, literal nazis and people calling for hatred. If /r/Conservative is representative of the average right wing user, yeah, it's normal they're getting banned, as they are absolutely incapable of reasonable discourse.
You also conveniently forget the local subreddits absolutely overrun by the far right. /r/canada was so bad that /r/onguardforthee had to be created. /r/metacanada regularly calls for eugenism. /r/france has the far right coming out of the woods every day.