Societies will always evolve organically to whatever end will satisfy its population.
Interrupting that natural chain of events (or even worse so, forcing your own morality and government upon an alien culture) unnaturally upsets the path of change. Internal problems should always be attended to internally with no influence from outside agents. The society will adapt to survive and maintain order. If the society cannot adapt it will collapse, and rightly, so that a new order may rise from the ashes of failure. When a dog is sick and can no longer perform it’s duties it must be put out of its misery. A order that cannot keep itself alive must be allowed to die. There is an illusion of health that is created by the interference of outside ‘peace keepers’ who decide to brace their backs against the collapsing roof. When these ‘heroes’ leave the dog once more cannot stand on its own and suffocates under its own decaying mass. But then an amazing thing happens: the soil is enriched by the rotting flesh and flowers begin to bloom upward through the rib cage. Soon a civilization exists on the skeleton of a diseased one that came before it.
Remaining politically isolationist is especially important for a republic like the United States. It was the dying wish of George Washington, and for all the right reasons.
While we haul loads of grain into the hands of corrupt warlords on so-called humanitarian missions who would use that material to sustain armies or trade in heroin, there are mouths to feed at home. Never glance from the res publica until harmony exists there, until justice is there.