Should Mein Kampf and other "evil manifestos" be banished?

This is insipired by this thread.

Freedom of speech. many people want freedom to express or say what they want, but they refuse to let it be a two way street. It is a two way street. When Voltaire had an interview with someone (I forget who), the interviewer said something very offensive to Voltaire. Voltaire replied “I don’t like what you are saying, but I will defend your right to say it” I’m paraphrasing

Learn from the mistakes of the past. If a “bad” book is banned, how will future generations learn from the mistakes? If another power similar to Hitler gained power, wouldn’t it be easier to know the enemy? Doesn’t it make it a lot easier to tackle a situation like that if you know the pattern it will follow?

These were my views. Express yours please!