"guess which side resorts to violence to quiet the opposition?"
So you are saying somebody telling you you might get shot by a sniper when you were at a convention amounts to actual threats or acts of violence on the part of the Republican Party? Or maybe getting some attention from security while acting suspiciously and dressed like an old-time anarchist while in the close vicinity of the sitting President of the United States somehow cramps you up?
When you think "violence" and "political conventions," if you're as old as I am, you don't think "Republican."