Who decides what is in our interest ?
Our Founders said we only go to war with a Congressional Declaration.
1. That's why we have elections to vote for those who have those values, not to play moral equivalency games.
2. I see you subscribe to Paul's edited version of the Constitution. Congress can call for the use of military force for more than just a formal declaration of war. Article 1, Section 8 gives three ways military force can be used. 1. Is, of course, a formal declaration of war. 2. Is suppressing insurrections and rebellions. 3. Is punishing piracy and offenses against the laws of nations.
Paul constantly says Iraq and Afghanistan are 'Unconstitutional' because they only have an 'authorization to use force' versus a 'declaration of war' (funny considering he voted yes for the Afghanistan conflict). However, both of those fall under instance 3 stated above. As the conflicts are greater than a nation versus nation battle and the reasons (using Iraq for example) fall under offenses against the laws of nations such as breaching peace treaties, attempted assassination of a former president, firing on our aircraft, funding terrorist and criminal elements, etc- the Authorization to Use Force is a Constitutional use of the military in that manner and it did go through Congress as required.