Hello, Example: In tournaments you see people sparring and accidental get hit very hard.
Sometimes you will see someone get mad/angry and start to let there emotions get to them. ANGER/RAGE...when hit by accident!
Others just brush it off? Why? is it natural to get ANGER or they choose to be anger? and for those who choose to smile? should they get angey instead? learned? or natural?
Aloha
Anger is an emotional response - like love, hate, joy, loathing, etc. One can learn to control anger, just like one can learn to control any other emotion - that doesn't mean you learn to not feel anger, but that you can choose how you respond to what you feel - the same way a person can feel attraction, or even love, for a person who is unavailable (e.g., attraction/crush for a person who is married); you can choose to not respond to that attraction.
Likewise, when someone hits me in a tournament or any other sparring session, I may or may not get angry, depending on the circumstances (how hard I was hit, the skill of the person hitting me, etc.) - but I do not let that anger, if I feel it, affect how I react, because getting angry is the worst thing one can do in a sparring match, or, even more, in a fight - because anger causes one to react without thinking, and that's very dangerous.
As to
why people respond differently in similar situations - we are all
individuals, and we respond based on our individual personalities and experiences. We are the sum of our past experiences, training and genetics, and therefore, we will all respond differently in the same situation - even identical twins will demonstrate different responses as they get older and begin to have separate experiences.
There are too many variables to say precisely why a particular person does, or does not, react a certain way - but I do think that having a positive role model, someone who controls their anger instead of letting it control him/her, is what many people need to learn to do the same thing themselves. Sometimes a single good example is all it takes, and sometimes that's not enough, depending on the person's background. There is no simple, clear, direct answer to why some people can control their anger easily, some control their anger with difficulty, and some let their anger control them - especially as an individual's ability to control anger will often vary with the situation.