Conscious probabilistic thinking is perhaps more demanding of energy. But all animals engage in subconscious probabilistic thinking. That gut feeling you have for example is your inner bayesian logic refined from millions of years of natural selection. The child being afraid of the dark is demonstrating deeply ingrained probabilistic thinking and assessing survival risk in real time. The higher order abstractions modern language and modern structured society saddles upon us often get in the way of how our mind actually works, as they are far younger than the mind. Poke a bug with a stick: it runs away. Poke a lizard with a stick: it runs away. Poke a human with a stick: it runs away. This example is an ancient survival mechanism all shared by the common ancestor of the human, the lizard, and the bug, which is probably half a billion years old or more. And we won't necessarily get any better with the demands of modern language and society either, as these are under far weaker selection pressures (if any) than these other highly conserved behaviors.