Let's add a #4 to scourge's list: don't simply justify the existence of 120-, but actively find ways to put them to use. Impose stricter laws, implement the death penalty, and so forth.
But this would not work, for the simple reason that we live in a different world than did Alexander the Great, or any mighty civilization before us. We face overpopulation, and it is the weak, complacent, and oblivious who are always ready and able to drown out the feats of the mighty. Our neighbors are not barbarians, we can't go and conquer lands in pursuit of knowledge and riches. We know what is out there; we are in contact with most of the world at this point. Our civilization is the result of the mighty feats of the past.
Really, they don't "deserve" anything, but if we want to bring our ideals to light, we must do something with them. We can't ignore or justify them any more, as our economy is collapsing and there is simply not enough room for them in society. It's their prevalence that is more dangerous than their stupidity.