FDR and Cordell Hull had the Good Neighbor Policy that was theoretically based on US respect of national savereignty in Latin Am,erica and refraining from military intervention, though this was not exactly observed in practice. This policy too has a logic to it, given the Great Depression and WWII when the US really needed cooperation from its southern neighbors to overcome economic problems and defeat the Axis Powers. The Cold War from Truman to Nixon-Ford also had its own logic, operating on a doctrine of intervention either direct military, or engagining in counterinsurgency operations to overthroww regimes Washington did not approve. When Carter came to office and announced a human rights dimension to US policy, we enter a series of contradictions, because the US had Communist countries in mind and not its own allies around the world, from Arab regimes to South Africa. It is in the mid-1970s that the US begins to have an intense debate between the managerialists that believed militarism under NSC #68 is not working, and the Committee on the Present Danger with neoconservatives insisting on an even greater commitment to militarism. This debate has been at the heart of the contradictions and it became much more complicated once the Communist bloc fell and the US opted for the "war on terror" to replace the global anti-Communist campaign.
Robert Ford, former US Ambassador to Syria, had stated that US policy of assisting anti-Assad Islamic militants would result in terrorism that could potentially touch US interests in due course. Ambassador Ford noted the example of Afghanistan in the 1980s when the US trained Jihadists that would eventually turn into al-Qaeda. Today we have a situation exactly as what Ambassador Ford described. This is because Ford along with many others has been warning that collaborating with rebels in Syria would only strengthen Islamic militants who would then turn against the West. If this isolated incident were the only contradiction in US foreign policy, all would be well. The problem is much larger.