Ah yes, because violence people who think differently to you has never led to extremism and said violence being returned to you…apart from the many, many times that it has.
Seriously, if you think that initiating violence against right wingers is going to lead to anything except right wing extremists using violence on everyone else, you really need to look at your history books again.
You’re the one who needs to read some history books if you think violence isn’t the solution. It’s the only solution that works. Fascists using violence back isn’t a counter-argument. That’s only logical and part of the equation.
But better than for just on the aspect of fascism, I’d really recommend Reflections on Violence by Georges Sorrel, before you condemn violence to be a last resort and inferior to pacifism or civil debate.