Seems we would be better off just keeping all that money for ourselves.
Exactly! One of the main ways the federal government justifies its existence is by coordinating the national defense from invasion.
Mexico and Guatemala reach and agreement to coordinate the ongoing invasion and the federal government demands more money to, among other things, build permanent infrastructure, e.g. housing, for central Americans.
Call your congress varmint: grab him by the ears and tell him, “Not one more nickel of American tax dollars to pay for the ongoing invasion of our country by central America and Mexico!”