This lets hate fester unseen, and his ideas go unchallenged by serious inquiry
Not having it in libraries doesn't stop people getting it - this is the age of the internet.
Unfortunately, the spread of US-based ignorance (sweeping statement) spreads. Like it or not, US politics and opinions dominate the global narrative in many ways, even if they are coming from people who are not well-read and have never been outside their own country - yet believe they know what the rest of the world is like.
Those lived consequences are important. Pain is a good teacher.