The op and follow-up attacks on posters here in the forum don't make any sense at all. We've all taken the political compass and all of the left-leaning persons in the forum are in the left, pro-liberty quadrant. Likewise, most of the right-wingers are in the right pro-liberty quadrant, though it's possible some are in the authoritarian right quadrant, I don't remember seeing that. When you look at western countries such as UK, US, Australia, most politicians are following along that diagonal from left liberty quadrant up to right authoritarian quadrant. No one in the forum has been criticizing the political compass in the past and so trying to do it now just as a means to support these nonsense attacks would be very politically biased and obvious.
Right wing authoritarianism isn't just a place on a spectrum. It's the human nature behind the spectrum. The more closed minded you are, the more right wing you tend to be. The more fearful you are, of change, of Other, of new ideas, etc., the more right wing you tend to be. And that's the mentality that is ok with dehumanizing the Other. The more you want to or have been conditioned to obey authority without question, the more right wing you tend to be. Etc.
It should be obvious how such minds will be easy to manipulate for right wing leader types (same general us vs. them world view, but obey no authority but themselves, like Trump, for example) to use as they please. Also very easy for such leaders to justify sending those followers off to kill people, whether in organized "legal" war or just zealous violence against whoever the leader has identified as the enemy.
Given the right conditions for a long enough time, anyone can end up in that mindset regardless of where they started. But when you don't start out with that right wing mentality I mentioned above, and your world view and mentality are more open, less fearful, more concerned with making sure everyone is taken care of and not just you and yours, more open to new experiences and different cultures, more willing to question authority, the less likely you will end up being ok with extreme right wing us. vs. them violence even in times of fear and unrest.
Even if the left can be bat shit crazy in its extremes, and it can, trying to find an equivalent to right wing authoritarianism among leftists is not just futile and stupid, it's a distraction from whatever problems may well arise on the left and especially distracts from the problem of right wing authoritarianism.