Grey, your attitude is one way to lose a war(there are many). If we don't develop this technology don't you think others will? Everytime a country has fallen behind on their warfare R&D they pay for it because other people do not stop.
Man is an animal and like all animals he fights. And when you lose any advantage you put your place at the top of the food chain(We have our own "food chain" though it has more to do with survival than food. America, Britain, China and maybe Russia being pretty much at the top.) in danger. And I would rather be at the top.
If you think some new technologies will "trivialize" war then you should take a long hard look at the rather checkered past of the human race. Peace has never meant much on this planet or it appears that way since I cannot remember a decade in which there wasn't a war SOMEWHERE. For all the moans we make over war we never seem to stop it.