There's the ego we must watch out for in the tech community. These people are dangerous cause they believe they know better than everyone and should be allowed to police them. It's not your place to tell people what they can and cannot say.

Though Microsoft has the right not to provide a platform for such things as a private company who doesn't live off the coffers of the tax payer. The line gets a bit blurry though as these platform become ubiquitous and becomes the main means of communication. It would be like censoring people talking over the telephone. It's a grey issue.