Without commenting on what we do or do not know ( ), you are correct. The same 'play nice' rules still apply here. HOWEVER, the topics discussed tend to be polarizing and therefore more confrontational discussions are allowed. One should not take this as meaning you can call someone else "stupid," etc. On the contrary. It means that you shouldn't get your feelings hurt if someone strongly disagrees with you.
Also, don't get your blood pressure up when someone posts a link / discussion from a radical blog or news source.
We are tired of getting PMs / emails that complain about the 'tone' of someone's argument. Likewise, we're tired of anyone who uses bullying tactics to get a point across.
In summary, we can agree to disagree without being disagreeable...but don't come crying to us every 5 minutes if you don't like how somebody said something. THAT's the message.