Think about how most people are naturally scared of heights, or snakes. A lot of dogs get freaked out by snakes too, or if you play with a hair clip in front of them, which looks like a snake.

The ones that aren't afraid of those things are more likely to die from falling off a cliff or being injected with venom.

I'm personally someone who is freaked out heavily by insects. I know logically a house centipede or a harmless spider can't hurt me, but seemingly my brain has something in it that overrides my entire body when I see one and disgusts me. Usually it's irrational, but it probably helps humanity on a larger scale to avoid the ones that are dangerous!

There's a lot about the humans body that naturally gives us non-logical instincts that help us to survive and breed. People like having sex, regardless of whether they want a baby. There's no logic to it, but we know what we like!

The more advanced we get, the more it becomes apparent that we're just monkeys in shoes.