When you say no comments, you actually protect yourself from talking any side.. Being politically correct and all.. But it also gives a very bad image of you.. It shows that you dont have the authority to comment or you are running away from the situation.. It requires courage to comment and then stand by it..
But there are situations where you actually have to comment and your comment is gonna be implemented or heard.. One such situation that I faced is within the friends.. If there is any situation or some thing and you say no comments then that can imply many negative things.. It shows that you are not interested in what is going on or what the situation is.. You are afraid that may be your comments will break some's heart.. N many more conclusion can be made..