Uh, that quote explicitly says the opposite of "Everything needs an explanation."Everything needs an explanation. It is required by the first words of Roddenberry. In the TOS writer's Bible it said:
"Tell your story about people, not about science and gadgetry. Joe Friday doesn't stop to explain the mechanics of his .38 before he uses it; Kildare never did a monologue about the theory of anesthetics; Matt Dillon never identifies and discusses the breed of his horse before he rides off on it.