I thought I already explained that. To elaborate: the US military has been involved in dozens of wars or conflicts since WWII alone. In most cases that was with the support of a large majority of the population. Whether any or all of these military interventions were necessary/justified or not is not relevant in this topic. They all indicate that there is no stronge incentive in American society for peace, i.e. the absence of war. Since such a sentiment exists, why would it be of importance to be ranked highly on a scale that measures exactly that, viz. the absence of war for any reason ?