emotion in trading

I always thought - and I admit being new - that if emotion is introduced into trading - you might as well p.i.s.s. your money against the wall.

I always thought that emotion is the biggest cardinal rule when it comes to trades.

How is it that many of you let your emotions run ballistic? Is this a strategy I'm missing?

I figure that the cool calm traders are making sqillions out of the emotional contortions that happen on HC.

Maybe I'm wrong.