Unortunatly, this behaivor is not isolated to humankind. A recent survey on gorillas and chimps killing rival family groups. As long as human males strive for dominance and power over eachother, things like this will hapen. in times past, it was a good stradegy. back then the more powerfull you were, the better chance of passing your genes on, if you know what i mean. Look at Genhghis Khan, who concured two thirds of eaurasia. They beleive that 8% of people living in his former empire bear the leaders genes.
In eveloutionary terms he was very sucessful [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile_t_32.gif[/img]