Not literally (obviously).
In a Kluge kind of way:
The reptile brain has been evolving for far longer than the newer functions that allow pro-social behaviours. It is responsible for your gut feeling – a surprisingly powerful probability processor!
Under competitive conditions, the ability to take quickly calculated risks produces a profit. But fear and stress actively shut down the parts of your brain that allow you to engage socially. We live in a Psychopath Factory.
“It is not power that corrupts but fear. Fear of losing power corrupts those who wield it and fear of the scourge of power corrupts those who are subject to it.”
– Aung San Suu Kyi
As a result, some of us are over-competing:
Which is why in your gut you already know we’re ruled by reptilians.