I have it on good authority that it takes six flags from ordinary users to delete a comment. This makes no sense; it only takes five community votes to close a question, and three to delete a post.
Comment flags are not surfaced to 10K users. That makes it harder for the community to handle comments on its own (without moderator intervention), and essentially limits the audience for comment flagging to the participants in the post.
Please lower the threshold for deletion of comments from six flags to three.