Large swaths of the American public have reason to favor military adventurism abroad. Perhaps they hold evangelical beliefs that the state of Israel must be defended at all costs to life and treasure. Or maybe they legitimately fear nuclear weapons in the hands of suicidal madmen. Regardless of their reasoning, or lack thereof, they genuinely desire to wage war in the middle east and around the globe.
On the other end of the spectrum there are many who favor, possibly naively, diplomacy and trade over sanctions and war. Perhaps they feel that pre-emptive war increases the number of one’s enemies instead of reducing them. They may also feel they can no longer afford the costs of slaying dragons abroad.