Anger is a dangerous emotion. It can stay bubbling under the surface, threatening to burst out. It can be so overwhelming that you literally go insane from the feeling. I've been so angry sometimes that I felt like i would explode. But i don't think anger is a dangerous emotion because it makes you do things you wouldn't normally do. Lots of emotions do that. It's the fact that sometimes it stays buried so deep that you don't even know it's there. And then one day, it springs up on you.
I've been shocked by my anger many times. That buried anger seems to me the start of psychopath behavior. When you smile and look calm on the outside but you're really sharpening knives in your mind. You can't bring it up, because you're probably angry about an incident that has passed. Something you should be 'over'. So you live with it, pretend it doesn't exist. Live with it in the hope that it would dissapear.
But what if it doesn't? What happens when you explode?