In a way they did. in the 1980s, Logo was popularly taught in elementary schools, and while lacking sexps, it was clearly inspired by Lisp in the way it was a functional language in the way the other popular teaching language BASIC clearly wasn't.
I certainly agree with the comment that what matters at an early age is what you can do with a language. I wanted to make GUI applications or games, and Java and Javascript hadn't been invented yet.
However if you dig deeper geometry is just the beginning eventual goal is to teach you to simulate movement of insects around light, predator-hunted scenarios etc.