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When you disseminate materials for purposes beyond inquiry, intentionally for the purposes of subverting facts, it becomes a tool of aggression. You have to understand the roll of propaganda, and revitionism specific to the Holocaust to understand why these laws are addressing issues beyond free speech. Of course on a very simplistic naive level, there is a free speech aspect to this which is a no brainer...but it's far more complex then that.

You can't understand what crosses the line, unless you understand the history well enough to know the implications of what you're writing.

Look at what happened in Rwanda, for example, where language was key to inciting the violence on a level which will take generations for them to really heal from. Can you understand how there will be certain ways of discussing Hutus and Tutsis that will be off limits, because of the connotations it has?