It is in our interests to make sure jihadists do not control any more countries than they already have. If we don’t support our allies (say Israel or Afgans), we will one day have to go there and finish the job ourselves.
This is what happened in 2001, if you have forgotten that.
I agree 100% that we should not be the the sponsor for the outside world. 90% of the money is outright waste, but some of the money is absolute critical to us.
For example, maybe if we had spent 2% of the Afgan war costs to foreign aid to Afghanistan in the 1990’s we would have prevented Al-Qaida to take over and 9/11 would not have happened and we would not be fighting there.