"Bigger bang" created for U.S. military

Click on this link to read a BBC story (8-19-11) about new forms of explosives that promise to deliver a 4-5 times greater punch while, potentially, reducing collateral damage. While such (expensive) technologies could deliver a temporary advantage to the U.S. military, should we worry about the proliferation of such materials? Are there weapons that should never be operationalized because of the danger, should they spread? Or is the "if we don't do it, someone else will, so we might as well be first" principle applicable here?