I never heard of anyone who was really literate or who ever really loved books who wanted to suppress any of them.
To become self-aware, people must be allowed to hear a plurality of opinions and then make up their own minds. They must be allowed to say, write and publish whatever they want. Freedom of expression is the most basic, but fundamental, right. Without it, human beings are reduced to automatons.
It really doesn't matter whether it's the villain or the hero. Sometimes the villain is the most colorful. But I prefer a part where you don't know what he is until the end.