Violence is just as an effective tool as any other and most of the idioms utilized to downplay it or dissuade people from using it come directly from those who used violence to acquire and remain in power to keep those they have power over from using those same tools and removing their power.
Media has consistently used this portrayal of violence as the last resort of the uncivilized to paint a very specific picture that keeps people from being able to enact change.
Read a book. Violence or the threat of violence has had a place and been a prime component of the reason change was enacted for any number of social movements or country defining changes (like maybe the Civil War?)
I do not believe for a single second that violence or violent protest or the threat of violence is inherently bad or ineffective. History indicates otherwise.
I am not advocating to go out and start shooting Trump supporters. I'm saying that when the rules of the game that everyone is supposed to abide by are being used against or not even being paid attention to by the other side, than you're an idiot for continuing to play by those rules.
This is the kinda meat I wanna get into, no offense to anyone else. Clearly this single act against Milo and his cronies is excusable taken in a vacuum. Protest may lead to violent protest and should be handled by local law enforcement as needed. The end result either way was going to be Milo backing out so I think we can use this platform to talk about the philosophy of political violence as a tool for political and social change.
It's been quite some time in America since real leftist violence was happening due to political and/or social pressure, so this kind of reaction is new and scary for a good many people and especially so for a good many (white) liberals, which explains the reactions. In time most of that will fade I believe as the white-nationalist and neo-nazi movements become more active and vocal. White liberals will have to become less supine.
However I do take issue with what you said:
"I do not believe for a single second that violence or violent protest or the threat of violence is inherently bad or ineffective. History indicates otherwise."
I'm not sure you meant it, but I disagree that violence or the threat of violence is not inherently morally bad. We have to be relative about it. Violence has a baseline moral weight that can change depending on the perspective of the person (yes, I'm using special relativity as an allegory for violence). From the perspective of a trans woman having her dead name chanted by a group of Milo's thugs, violence is less morally wrong than it is from the perspective of white guy dean of not-giving-a-fuck, right? If the violence (in speech or action) is not directed toward you then we have to rely on empathy in order to step in and change a person's perspective.
So you get a bunch of people disconnected from the violence of Milo's rhetoric, they understandably can't fathom the violent reaction and condemn it. If someone came to their university or workplace and began violently haranguing them to the cheers of hundreds of their supposed peers, they'd certainly begin to understand the need for violent reaction.
How can we make them understand without this? Especially when Milo picks his target carefully so as not to alienate those with the most power?
I dunno. Tying the fundamental rights of the oppressed directly to the fundamental rights of the moderate observer doesn't seem to work. Empathy seems to only take one so far. Maybe liberals are doomed to repeat cycles of oppression and fascism leading to state collapse brought on by bad actors who have no problem employing violence toward violent and destructive ends?
Do we as liberals and progressives need to adopt similar violent and destructive ends? That'd be similar to early 20th century leftism, and it got
some shit done I suppose. Can we accept the necessity of violence without losing virtue? I'm just rambling at this point, because I want a definitive answer even though there doesn't seem to be one.
Violence is inherently wrong, but sometimes that's outweighed by the need to violently react.