Because (i'm guessing, since you're on HN) that you're an engineer. You spend all day telling the most logical thing ever created how to act. Its as predictable as a childrens television show. Human psychology is irrational, and thus unpredictable. The engineer psyche doesn't like that.

Human psychology is irrational and unpredictable only for very narrow definitions of rationality. Just because we don't understand the brains operation doesn't mean it doesn't behave rationally

Those definitions of rationality are useful _because_ they are narrow. If you redefine "rational" to mean "how the brain operates", you might be able to stop using the word "irrational", but...all the phenomena that previously fell into the "irrational" category will still exist, and people will still want to discuss them, so you might as well just use the same word for them as everyone else does.

The term "rational" is already well defined. I was claiming that the OPs understanding of the meaning of rationality was limited, not that the term rationality was narrow.

There are many other words and phrases available for us to talk about this concept that are well understood and do not need to be redefined.

I feel the same way.

My guess: it's hard to consider adults are less curious than children, but more confident than children. In biology: maturity = stop of growth

because stories like those should make you depressed