Then don't comment on their site? I mean if you're looking for discussion online, there are thousands of places to go. But this is specifically about the comment sections they provide. It seems entirely reasonable that a room they provide should be subject to their rules, and one violating those rules should be shown the door.
They never said that Talk was aimed at moving that goal further along, however. They're trying to use it instead to allow better curation tools to make comments manageable.