So why hasn't it been defeated? Perhaps the arguments against it haven't been shrill enough. Perhaps the creationist protagonists descended into name calling a bit too soon. Maybe studying the math, physics, chemistry, and biology necessary to refute it had a poisoning effect on those who have attempted it and left them mindless evolutionists. Just guessing.....
Or maybe the Temple of Darwinistic Materialism has become a de facto (and unconstitutionally) established religion and, as such, is being protected by the state.