There is something I don't understand: The US (or at least certain agencies) have been involved in creating or supporting insurgencies in different scenarios (e

There is something I don't understand: The US (or at least certain agencies) have been involved in creating or supporting insurgencies in different scenarios (even Afghanistan itself) for most of the post-WWII era. There has to be an enormous amount of experience dealing with para-military groups and a lot of examples of how not to deal with one, e.g. the Soviets in Afghanistan. I would have expected that experience to pay off in the current situation. Either supporting an insurgency is radically different from combating it or all that knowledge is lost in the cracks between the different agencies conducting those operations.