I don't really see how it's Trump's fault that people crashed and ruined his event, then harassed the legitimate attendees and fought with police officers as they were leaving when it was cancelled. It sounds very much like people just don't like Trump, and are willing to overlook what was honestly a pretty shameful display because at the end of the day, it got his event cancelled.
I think the general mentality is that he escalated it, so they're gonna escalate further.
There may be somebody with tomatoes in the audience. So if you see somebody getting ready to throw a tomato, knock the crap out of them, would you? Seriously. Okay? Just knock the hell— I promise you, I will pay for the legal fees. I promise, I promise. It won’t be so much ’cause the courts agree with us too.
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Source) He advocated using violence to shut down protests at his rallies, so more people protested. I don't think there's anything wrong with showing up at a political event and shouting down the candidate. Violence is something else, and I don't support the use of it to prove a political point (obviously). But if the protesters were defending themselves, that's a different matter.
Part of the problem, and part of the reason it takes so long (to remove protesters), is nobody wants to hurt each other anymore.
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Source (7:33))
He fosters an attitude of violence in his supporters, promotes them committing violent acts on protesters, and then acts surprised when the two clash. I absolutely think he can be blamed for that. There are plenty of ways to calm a situation like this, and he just escalates things. He's getting what's coming to him, to be perfectly honest, and I just expect there to be more and more protesting, and violence, at his events. It is absolutely his fault for creating that type of community. It sucks for those caught in the middle of it, and I don't think either side should be violent with eachother, but he is the one promoting violence and escalating the issue of protests.