I don't know when this problem started. Certainly before WWII, possibly before WWI.
It's kind of like what's portrayed in many of the Bond movies. The President want to test his/her powers. Some foreign leader calls him up on the phone. Maybe they've met before when they were younger, maybe not. This foreign leader is — among his other talents — one hell of a good salesman, and determined to solve whatever his problem is by any means necessary.
So the President says "sure Alexi, I can put my people on that, if you do X for me." That's how things are done in this world, the President has learned. He figures "hey, I'm the President of the United States, I can handle that problem for old Alexi." Kind of like one of the Bond villains, in the huge office with the huge button-covered desk and the gigantic shark tank behind him.
Only problem is, American kids have to go die in order for the President to be such a hero to one of his fellow President club big-shots.
The only guy in recent years who said "no" to this dynamic was Donald Trump, and he was kicked out before you could say Jiminy Cricket.
Excellent and Important Observations, all.