Psychology is not an exact science.

It is a field that Sheldon Cooper from The Big Bang Theory would deride for its lack of mathematical verifiability, and he’d be right. After all, when Sigmund Freud was pulling stuff out of a lower orifice to describe the “anal stage” of psychosexual development, Albert Einstein was creating theories of the universe that remain valid to this day.

Humanity’s understanding of physics allows humans to build rockets that only sometimes explode. Our understanding of psychology allows us to … uh … wait.

It’s not as bad as I allude to, but it is a discipline in flux. Homo sapiens’ neurological processing unit is complex and beyond our current understanding of mathematical formulae to neatly explain.