Oh sure nuttin like two tribes of a thousand in the entire united states going at it all the time makes total reasoned sense. Oh yea. Sharp observstion there what wss i thinking. Oh its a genetic defect.Population growth does not increase the probability of war. Population has always grown with the possible exception of the Dark ages(don't follow it that well). War is at it lowest currently with the highest population ever. There are many more factors then population for causing war.