I think my school librarian is Hitler reincarnated, what should I do?

I can't imagine a librarian that burns books like Hitler did. But if that is what your librarian is doing, then you need to tell someone. If your librarian is killing people for the sole reason that they are Jewish, you need to let the police know. If your librarian is telling everyone that they believe in a master race that all other races need to serve, you need to talk with your principal about it.