If we know stress is harmful to our health, why do we continue to build lives that involve stress? Whether it's baggage we've carried for decades or a new annoyance, if it's causing you stress it will eventually turn to anger.
From bullying to abuse to self inflicted thoughts of having been wronged in some way, anger builds until it must be released. Too many times we see how people "implode" and take others with them.
But take a look around. Anger manifests itself in other, less socially violent ways, usually long before extreme measures are taken.
Unfortunately, as a society, we are ill equipped to deal with other peoples emotional pain. We miss the warning signs, sometimes because they simply weren't there, the pain being so well hidden. Other times they stare us in the face and we close our eyes, afraid of what may grab our helping hands should we extend one.