The question is fine, it is the OP who is flawed in not realising that there isn't really a story here worthy of discussion.
What if the U.S. decided to never get involved with anything outside of its own borders.
Would that change your answer?
If so, then it means no foreign aid and no coming to ask for help when shit hits the fan.
If the U.S. is as you are saying, then we would have to remove completely.
Another question I would ask then, who is a greater potential to increase world security. Isis or the US?
The U.S. will bail your ass out when someone comes bearing down on you. Will ISIS?