They obviously have reasons. Without looking at the book, we can't say if it should be in schools or shouldn't. When explaining Racism to Grade 2 students great care must be taken. Imagine being the only black kid in all white classroom. You know you look different. Everyone does, but no one thinks anything of it. And then they tell you that you are systematically oppressed, and that your race, not your character, is the characteristic that will define your life experience. Good Luck kid!

Also, we don't see the list of other civil right books that may be in classrooms.

But the fact that "The Berenstain Bears and the Big Question", a book about God, was rejected suggests that this isn't some conservative conspiracy.

In fact, it sounds like a moral panic from the left.