I think you are looking at this ideologically. Since you hate Trump is is morally OK in your eyes for other people to screw with his rallies and provoke his followers.
If someone did that to a Bernie rally and people reacted you would blame the interlopers - because without the interlopers it would not have happened.
I don't "hate" drumpf. I hate his moronic speech. He's just an idiot.
here's the point you are missing: drumpf actually
ENCOURAGES people to be violent. He has said HE would hit this or that person, he has said his followers should hit others, he has said he would pay the lawyers for a guy at one of his meetings that was arrested for ASSAULT (and he won't pay, he's just all talk)
Bernie has NEVER encouraged people to be violent. He has NEVER said people should attack others, he has never said he wants people coming to his speeches to be violent against ANYONE else for ANY reason. And he condemns ALL such attacks, no matter who it is. Bernie attracts thousands of people and has done so for months. at no time have you ever seen violence at his gatherings. You see excitement, but it's quite peaceful.
I do think everyone who finds drumpf's message to be UN-American should say so, and loudly. But I don't encourage violence. That's ALL on drumpf. violence is HIS message.
