Honestly i blame the female population. Yes males are genetically inferior to female, we die easier when in an embryo and yes we are emotionally retarded in some aspects of life, such as color perception and taste, but at the end of the day i believe it comes down to sex. Not sexual intercouse, but the influence females have on males. The infamous aphorism "behind every great man, thier's a female" is given an entirely new meaning when, applied to society nowadays. As you stated early females suppress males in a lot of aspect. Studys have shown that females are mainly attracted to males of a more rough exterior, because during the "primitive era" those were the type of men that could hunt and provide, so forth and so on. Its because of this that females seek this in men, and a man seeking a female will alter his mannerism in ways to attract her. So yea, i feel what can lead to aggression is the suppression of our emotion, even though males have testosterone, so do females. Not as much, but testosterone none the less. And i'll tell you this, i've seen some pretty aggressive females to the point of it being scary, so genes can't take all the blame. At the end of the day, woman are the real creators of society, as a male im willing to say, that a lot of the things males strive for are in the pursuit for females.