One that comes to mind for me: "Whatever doesn't kill you makes you stronger" is not always true. Maybe even only half the time!
Are there any phrases you tend to hear and shake your head at?
"It's human nature" used to describe something horrific like war or rape.
It's not. Human nature is as when we were children, playing with friends and loving each other.
Militaries have to condition humans to do violence to each other and to follow orders from "superiors". Half of school is quashing kids' creativity and making them follow arbitrary rules because "the adults" say so.