Lefties are living in a complete alternate reality.
Scott Adams actually covers that in his videos on the 2 movie hypothesis. He linked at some point to an article that we don’t have to live in reality, only a system of behavior that meets our evolutionary goals.
I’d go one step further and quote Heinlein, such as a mother’s delusions about her child’s intelligence and beauty serve an evolutionary purpose - keeping her from killing the inconvenient creature at birth.