Evolution tells WHY, not that what it right, what is wrong, or how you should do. In order to avoid misleading interpretation,  this message is in ugly English again.  Sorry, some may construe what I am saying as a judgement of daily life. No, this is only an academic analysis  for those who are really interested in this topic. 

If a male says that "I am a very nice person except that I am easy to get angry", he may be really a nice person. What do I mean by "nice person"?  It is from the point of view of "relationships", or put it clearly, a sexual partner.  Then, if a female utters the same declaration, is she a "nice person"? This is the key question of this post. 

Behaviorally and psychologically, anger is a masculine character, it is a sign, or a tool, of dominance. How do you express your anger in front of the guy that is more dominant than you?  Anger is a aggressive signal, it often relates to competition and fight, if you are not strong enough, you are not "qualified" to be angry.  

In fairness to the "angry female", anger is not such a bad thing, she may be more successful in commercial or political circumstances. AND, it may be good to her children, she may have a full control to her children, and can manage them well in studying, achieving good school scores. 

BUT, there is no school or piano in the far past when human mental essentials evolved.  In millions of years of prehistory, children did not go to school, they did not play pianos. In those old days, children grew naturally in the wild, they needed their mothers care, not control. In particular, too many restrictions and control are very harmful to their psychological development, they will have less competitive advantage when they reach adult ages.  

From the point of view of a male, when he chooses sexual partner, he is choosing a would-be mother of his future children. This is a basic assumption of sexual select.  If his partner is dominance, arrogant and quick-tempered, it is very probable that he will have a very submissive son. In this vein, it is really a problem of "sexy son". For females, "sexy son" is a good gene, but the other side of the coin is to some extent controlled by herself.  

Furthermore, human newborns are extremely altricial, they are born helpless, so the male should seek a SOFT and NUTRITIOUS container, the container is his wife. What is SOFT here? It is fat(are you scoffing? have a look at my book "THE UGLY PEACOCK"), it is a good temper.  Dou you know what happened to Mr Liubei when he was angry? Joke;) 

If there is a male whose only emotion is anger, this may not be a bad thing. Many strong figures in movies is something like this. Studies show that although females may prefer happy guys, but for short-term relationship, females often prefer "angry" guys:( 

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New term starts soon, this is the end of the vacation post sequel...