There are so many ways to be reductive. Reduction is so seductive. It is easy. But rarely does anything work quite that way. There are more factors and interactions at play than you can imagine.
But to function, the brain simplifies.
There is System 1 and System 2 processes that Daniel Kahneman
Humans need both.
The perfectly rational entity does not exist.
Even perfect rationality can be foiled by bad luck.
So where does that leave us.
Guessing. Ruled by emotion. Rationalized after the fact by selective information. And most importantly, pretty lazy.