Good point about people bottling up their feelings... that is definitely not a healthy pattern, and those unpredictable "explosions" have a way of coming along at very unfortunate moments!
It all reminds me of something I learned in psychology a very long time ago, about the dangers of unexperienced emotions as a trigger for depression. Better to get it out, as you suggest... and learn from the experience.
Indeed, and I think it should start at home to learn how to deal with those emotions. Then again there are still adults who also don't know how to express themselves. For them I would advice group counseling and when they've mastered it, hopefully to teach it on.