I think Trump has begun to do as you suggest: $300 million per year aid to Pakistan has been cut off until they stop sponsoring terrorism, and a bunch of failed States have been labelled “Shitholes” and put on notice.

Aid projects like Polio Plus are still valid, though. To eradicate this cruel disease we have to do it everywhere, even in shithole countries, or it will come back. While one child in Central Shithole still has polio, then all children everywhere are still at risk.