It turns out that mamals (of which we humans are a deviant variety) have a predisposition to thinking that big eyes are cute.

Because we think big eyes are cute, we tend to want to protect and nurture things with big eyes.

That may explain, in part, why human eyeballs never change in size as a human child grows up. As a small child, the big eye balls generate a cute reaction by the parent, therefore increasing the likelihood of survival of the child.

So it’s a not a Disney conspiracy. It’s our damnable genes.