IMHO I think that members of the Default Trust and Depth 2 Trust should be extra diligent about handing out negative ratings. I also feel that the ratings should never be set in stone and are subject to reevaluation if the subject has demonstrated that he has changed. That's why I'm always willing to take a second look at a rating that I've given out and see if it's still applicable. If not, it gets removed, simple as that.