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.
I agree about spaces to emotionally vent...goodness, the internet lets me vent about anything, at any time, with almost any audience of my choosing, through words, sounds, and video.
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
I'm not sure I understand the bit about digital technology, but this seems to me to be pure gold: "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??""
Regarding the digital technology part, for me it's basically saying that we have this messy, organic, chemical mix of things happening within our bodies, and then we condense all of that into one word, e.g., "happy."
What fascinates me about language, and frustrates me, and does many other things to me, is the fact that when I use the word "happy" it may be describing a different internal messiness than your word "happy," and yet, the more we have in common, the more I will often assume our definitions are the same. I can't tell you how many conflicts in which I've found myself from definitions that I assumed to be shared but were in fact different, e.g., "I'm ready to leave," lol.
What's even more interesting (to me, at least) is that venting might not be helpful.
"Does distraction or rumination work better to diffuse anger?
Catharsis theory predicts that rumination works best, but empirical evidence is lacking."
It is an interesting question. I've personally found that most venting and catharsis leads to repetition and maybe even strengthens existing patterns. Contemporary work on trauma (Bessel van der Kolk, Peter Levine, Gabor Maté) regards catharsis as retraumatizing and works instead with "titration", i.e. re-experiencing and expressing just a little at a time.
On the other hand, I've personally experienced a cathartic process that—as best as one can trace these things—brought real change, so there's no single answer about this.
