we now have nuclear, chemical and biological weapons.
LOL, we do indeed- but look at the current war in Iraq- which is being fought in the same way as World War I- with tanks, trucks & men with guns. War gives humans an outlet for their aggression- but if the weapons used are too powerful, then it just becomes extermination- which is not 'cricket', and usually happens more in natural disasters, where everyone feels sympathy for the victims. So there is a good reason why we haven't destroyed ourselves yet- technology has surpassed our basic emotional needs in the killing field. Boring, but true.