Dunno, maybe practice Zen Buddhism for a decade or two.
Quite possibly its arrogance, or jadedness. But I've come to develop my own opinions about issues like that, through other means of acquiring knowledge than science, which I feel is grossly inadequate to address such issues. And no, I'm not talking about secular/clinic types of mindfulness.
Probably that makes me a weirdo in circles like HN, but oh well.