What if it is a false flag, will you participate in the joint defense operation of ally? LOL This is why you need to be careful when you let your right-wing politicians change your constitution. The false flag operation is one of the most dangerous scheme that will lead country to an uninvited war.
Again, you are too idealistic. If you commit to peace, stick to being a Pacifist. The US already promised to defend your country. No reason for you to try meddling in other country affair when it has nothing to do with you. The moment you meddling in other affair is the moment you will run into conflict. Politics is complex, my friend. You don't get to choose. Other will force you to pick your hand.
Come now, no country will come in guns blazing without consulting all areas; be it constitutional, legislative, diplomatic. We are living in the modern world, not during the ages of Cowboys and Indians, Samurais and Ninjas, or Warlords and Generals.