I don't give them any thought what so ever. They are a reaction to the antifa and BLM movements. The Unite the Right Rally would have been completely peaceful if Antifa and others opposed to the right had stayed away. They came looking for a fight and created the situation where some were injured/killed.
To me, the Proud Boys and others like them remind of "The Gangs of New York" movie...totally ridiculous. But, the antifa and blm folks are really dangerous and pose a real and present danger to our country.
Your second paragraph is essentially correct and is almost exactly what I said before. Hitler renamed the DAP, Deutsche Arbeiterpartei, the NSDAP( Nationalsozialistische Deutsche Arbeiterpartei) . He included Socialists in his platform just to bleed support from the Communists. Once he gained power, he didn't need them anymore.
Why on earth would I be "proud" about Franco? I hate communists,fascists,and socialists, equally.
Your fourth paragraph supports what I have said three times now...once a socialist movement gains power, they consolidate that power and go full-blown dictator, a la Lennin, Stalin, Hitler, Mao, Castro, Chavez, and , yes, Bide...er, ah...Harris will do the same thing if they steal the election.