I came across the same observation from two separate books, Ender’s Game, and The Ocean at the End of the Lane. Both child main characters are told, “Don’t worry, it won’t hurt a bit” by adults. And the MCs, immediately after, think that that is a lie, that the only times adults tell you not to worry or that something won’t hurt is exactly when you should worry or when it will hurt.
I thought it was amusing and was wondering what other interesting observations you have read. It doesn’t have to be from a wise child MC talking about adults, but it could be.
The Culture series of Iain Banks. Consider Phlebas is the first entry in which the protagonist slowly begins to realize he’s on the wrong side of an interstellar war. He’s actually fighting against the values he believes in. One of the entries deals with hell and how the concept of hell is used to control people. Banks’ hells are computer generated to accept the consciousness of people who have resisted the system. I can’t recommend this series enough.