Because, and I'm not trying to be inflammatory here, common sense dictates that this is a volatile-enough subject to incite very wild reactions.
Or to put it more simply, ever heard of trolling? Like, the original variety of trolling, where a thoughtful and polite argument is made regarding something guaranteed to stir up heated contention?
You can understand English and still screw up your context.
By your logic, the March on Washington was trolling.
The worst revolutions begin on forums.
Careful now, you're talking to the next MLK here. Be respectful.
No and yes.. you can talk about it all you want there until they ban you. THEN you are right, you literally can't talk about it on their forums.