Cause and effect is prime to everything. It's the concept, the truism, that all the sciences, hard and soft, are based on. But there's no logical reason for the existence of predictability. We could just as well live in a totally random universe such as Fiorella encountered in her drug-addled hallucinations.
It's a matter of control--if cause and effect exists, we can predict what will happen next. If we know what will happen next, we can alter the future.
But always with the wild card of free will thrown in.