Funny that this time this started from the right side of the political spectrum.
Authoritarianism is the common denominator; only the details vary.
You can follow citations from these citations to find primary search that shows quite a bit of support for it in academic political science.
I’d go so far as to say I think anyone peddling horseshoe theory is a politically illiterate fool regardless of their supposed qualifications.
It’s funny that you want me to read the imitation though.
“ Several political scientists, psychologists, and sociologists have criticized the horseshoe theory.[3][4][5] Proponents point to a number of perceived similarities between extremes and allege that both tend to support authoritarianism or totalitarianism; political scientists do not appear to support this notion, and instances of peer-reviewed research on the subject are scarce. Existing studies and comprehensive reviews often find only limited support and only under certain conditions; they generally contradict the theory's central premises.”
I don't know what to tell you except that the term "red-brown" became popular for a good reason.
(And I'm far left myself, by the way.)
It’s not an argument at all IMO, but good for you.
> I'm far left myself, by the way
So you would, logically, describe yourself as a fascist then?