War again?

Is there no another way to use resources and energy except War? US is about to get into the Middle East regional conflict in Syria. A most intimate alliance country with US, Israel is preparing for the incident now. Relatively big war there that we have never experienced might happen involving many countries under the world recession these days. Mankind is not so cｌever mammal as to avoid killing each other however many times we might have experienced the same looking back to our war histories? Some of violent traits might have been built in our Gene? War expenses are only a trifle consumption with no constructive product, just an explosion of TNT, then who would pay for it, we must be obliged to assist US financially again as usual, how come?