The problem is that they are acts of war.
And they invite attacks on American soil. The enemies of the US are going to acquire that capacity sooner or later, probably sooner, and we're going to have the White House punched full of holes.
So, a bunch of Saudi Arabians could attack the US, and we'd have to go after Iran, and we don't have the troops, money or will. Except for the large oil companies.
So we'd be in another war, to the delight of some and the agony of many.