Why is banning speech a great travesty? Because it hides the truth. Perhaps someone will discover people you wouldn't expect involved doing things we wouldn'

Why is banning speech a great travesty? Because it hides the truth. Perhaps someone will discover people you wouldn't expect involved doing things we wouldn't expect which may cause some aspects from being denied to cease to be true. Silencing one groups end up silencing another. Why don't we have a law banning denial of other genocides like the Armenian genocide. There should be an equal concern for all genocides being denied.