Okay, so you don't like my suggestion but didn't suggest an alternate approach yourself... Forgive me if I don't take your rebuttal too seriously, then.
That's pretty close-minded, mate. Rejecting opinions just because others don't offer a solution to a problem isn't logical. It's just ignorant.
That's something along the lines of a Russell's Teapot argument where you place an onus on the opposition.
You definitely cannot do anything in which users have administrative power over others. The red-trusted scammers would have a field day just using the system against the people who had sent them the feedback.