Pear threw away his/her books on Darwinism a long time ago, along with his books on biology, physics, chemistry, astronomy, medicine, epidemiology, etc. You know, all the hard sciences that have contributed so much to human progress and knowledge but which Pearl doesn't need because he, as a totally untrained layman, knows better than the scientists who have spent most their entire lives studying such things.
Why do we need science at all when we have political ideology or religion? After all, those two things have cured diseases, sent men to the moon, built bridges, developed computer technology, built bridges, explored the cosmos, developed airplane/jet technology, invented air warming and cooling technologies, etc. We don't need no damned scientists, we need more uninformed, unknowledgable, untrained political/religious ideologues to tell us how things really are.