Because the Republican candidates are far more hawkish and all too willing to start new wars. McCain and Graham talking about intervening in Syria. Cotton talking about bombing Iran. People are tired of having our troops dying in any third world cesspool that the happens to be in the news.
Yup. But it even goes further than that. Take a hard look at American demographics. Particularly people of military age. The pool is drying up, and the military is loudly noting it of late. They have a very shallow pool of people to draw from who meet their basic qualifications. But what gop foreign policy seems to assume is that there is an endless pool of young people willing to sacrifice their time and perhaps their lives for the sake of crony capitalists and third world hellholes.
A draft isn’t coming folks and foreign policy is going to have to conform itself to the reality of a small pool of people who are willing to fight for whatever that policy is.