I agree with you that it could be argued that Kitzmiller involved censorship of a sort. I agree with you that students should have the freedom to check out a book like Of Pandas and People.
But, censorship was a minor issue in the case. I direct you to the following statement, which was added to the biology curriculum in 2004:
This was problematic. As the defense expert witnesses themselves acknowledged, under the NAS (i.e. accepted) definition of theory, intelligent design is not a theory. Judge Jones used this testimony in his ruling.