tl;dr you seem to forget that trust system is a "opinion-based"system, while some action may be untrustworthy but acceptable for you, it may be neg worthy for someone else. You can either follow the rating given or either exclude that person from your trust list so that you don't have to see feedbacks given by them or do see them but ignore them.
I too don't consider some people's feedbacks not valid, hence have them excluded, I'd advise you to do the same.