Do you guys purposefully leave comments downgrading answers in the comments? Over the past few days, I have given answers that were right and people decided to argue in the comments. I feel like it is an attempt to discredit some answers and get points by having the commenter's answer viewed as right by the question asker.
One of the purposes of comments is to allow users to say something on the logic or factual basis of an answer, and the comment can be supportive or work against an answer. If you find the comment to be valid, you should modify your answer to take account of the comment. If you find the comment to be ultimately wrong but based on a reasonable premise, you should probably modify the answer to show why the consideration given in the comment is not applicable in the present case. For instance, if you know of applicable case law that you didn't originally cite, you should cite that case law and explain why it is relevant. You can just ignore comments if you want, but they can be helpful in case you are not legally omniscient, or in case your answer is not self-evidently correct. Take them as an opportunity to improve your answer.
Comments need to be made to an answer when it is inaccurate or incomplete.
Neither law nor Law.SE are the place for "my answer was right" with no authority. ('I work for...' is authority if the question asks about that specific area only, but not otherwise, whatever may fill in the blank). Comments asking about points the answer does not consider, pointing out contrary authorities, and criticizing the internal logic of answers are fulfilling precisely the correct function of comments, whether or not you agree with them. Comments that just say "This is wrong" are out of place, as much as comments that say "This is right"; but criticism and disagreement are as fundamental in the law as they are in rational argument.