You are crossing your streams again.

None of these insurgencies "required" massive foreign support - but if we create an insurgency and dedicate ourselves to grappling with it, our opponents will certainly leverage our stupidity to their advantage. Be it to advance their own interests, or simply to cause us pain the pursuit of what we believe to be ours. No different than what we have done to dozens of other when the roles are reversed.

First, the US Civil War example. The strategic brilliance of Gen Grant's strategy was that he recognized in warfare between nations was new and different than warfare between kingdoms. He could not simply impose costs on the South by defeating Lee's army, or capture the capital and "win." He had to do three other things to mitigate the resultant resistance insurgency against our presence following the war, and to mitigate the revolutionary insurgency against the governance in those occupied former Confederate territories.

1. Ensure the population of the South were as defeated as their government and their military. He sent his two best Generals on that mission, in Sheridan and Sherman.

2. Implement total and immediate reconciliation as soon as the conflict was won. That began at Appomattox, and though damaged with Lincoln's death, was still a critical component.

3. Allow self-determination of governance IAW the Constitution.

This was brilliant COIN to reduce the degree of resistance and revolution following the end of the conflict.

Where we went wrong in our interventions was in not understanding the nature of resistance and revolution. This led us to opt for far more invasive regime change approaches where punitive expectations would have been more effective. It also led us to not take steps that could have mitigated the resultant resistance and revolution once we opted for regime change as a COA. We applied war theory to non-war problems, and believed that what we brought was so good that the people would not respond to us as they would to some less good-hearted invader.

All avoidable. And to blame our troubles on ideology or the UW efforts of others, or to not appreciate the fundamental difference between WWII occupations in Germany and Japan vice our interventions onto unvanquished populations elsewhere is to keep our heads deep in our 4th points of contact and ignore the strategic lessons before us.