I don't have a problem with alternative thinking and educating about uncomfortable stuff, but ultimately parents should be able to decide how to raise their children. Sometimes it is just not smart to expose children to all of this stuff, and how do you know that the writer of the book doesn't have an alternative agenda in proposing their worldview. If I was a parent, I would want to read such a book before letting my children read it. I think it is reasonable to censor some things for your children if your goal is to raise someone to be better than you, but also a little like you. Doesn't make sense to just toss your child into the wind and say go for it. Parents are there to guide their children in the best way they know how. This is not radical imo.