Earlier quoted context omitted.
You can have emotionless warriors or you can have emotional pacifists. You might even have emotional warriors, but emotionless pacifists is a hard sell. If the State monopolizes violence to the point that we can’t hash things out with our fists, and there’s no room in our society to emotionally vent, then what’s left? It’s not like violence disappeared from society, it just takes different forms when suppressed.
There's a lot of room in our society to emotionally vent; it just happens in private relationships and on internet forums. The challenge is that the emotions are often uncontained, and uncontained emotion is closely related to violence, as you say.
On the second part, I would say that emotions are often unarticulated, which may be similar to what you're saying. For me, what I've been trying to practice is that when I start to feel angry, to say "I feel angry" instead of "what is wrong with you??" I've noticed in traffic that if someone cuts me off, I'll have a reflex to cuss out the guy or say something about him being an idiot, and then I'll pause and go, "I really just felt afraid that I would crash." I could tell story after story about how the emotion is not being clearly articulated, and that when it is, it can really realign the situation.
But, to quote James Pennebaker, author of Opening Up (a book that I read and loved) and lots of work on journaling and emotions:
"Verbally labeling an emotion is much like applying a digital technology (language) to an analog signal (emotion and the emotional experience)." --from https://c3po.media.mit.edu/wp-content/uploads/sites/45/2016/..., an article I have not yet fully read.
So, in conclusion, maybe my unarticulated is your uncontained analog signal :-D