It has more to do with the revolutionary mindset. Right-wing revolutionaries in Spain, Italy and Germany had no problem organizing to crack skulls and terrorize their enemies. The purpose of protest organizing isn't to get voices heard; it's to provide the foundational context for street violence. A protest march is, at minimum, a threat of a riot.
The revolutionary mindset says that the existing society has to be broken down to build a better one. Violence and street terror are just part of the process. Since the left in America has a revolutionary mindset, all leftists, from center-left suburban moms to Democrat politicians to the psycho blue-hairs of Portland have an instinctive attraction to gangs of rioters smashing windows, starting fires, and sending people to the hospital. That's why the Democratic Party helps to organize, fund, and protect antifa, BLM, and other domestic terror groups.
By contrast, the American right is conservative, viewing longstanding institutions and rules as good things to preserve. It naturally abhors radicals and recoils from violence outside the system. The left hates right-wing radicals because they are right-wing, while the right hates them because they are radicals. Consequently, tactics designed to enable radicals have no home on the right.
