Unwanted Commentary??

The Assembly of First Nations in Canada has started using YouTube: http://www.youtube.com/watch?v=X_bK_ww0rDA. The comments and responses section has not been turned off and it includes numerous comments of questionable valuable. Recently I received an email drawing attention to the site and comments suggesting that: “what we need are sites where people can post their videos without having to be concerned with attracting unwanted commentary” and asking for feedback. Not sure what to respond….shouldn’t all commentary be allowed? Who will get to determine what is ‘unwanted’?