The US is the major funder for the United Nations, an organization that runs like a banana republic, and has been responsible for many, many sick crimes under the guise of "peacekeeping" world-wide. Sure, UN aid and UN food drops are great, but the corruption of food-for-oil, etc, was criminal, and we should have bailed.
Same for the enormous amounts of aid we send other countries. You don't know how much we send? No one does!
You cannot say "screw them all" because we do derive some benefits from our spending. But it is a lot of waste.