Revolution may explain why sometime human act like animal

It is really cliche when arguing human revolution, but there are things ,needed to be considered. For example, two men are in love with the same girl, and so in order to have her love they slay each other.Of course the winner will be with that girl. Just like animal, human do whatsoever it take by the mean of survival. Wolf beats other for the female it yearns. Sometime mankind act like animal even though they don't notice.