With exclusions, if there is a group of people who show a willingness to exclude anyone who doesnt leaves ratings the way they want, this group of people effectively control the entire trust system, and will effectively be immune from ever being held accountable if they were to scam in a way that is less than 100% clear is a theft, and is refusing to answer questions.
This is actually a huge security flaw, I am not sure why anyone thinks having a group of untouchable users here is a good idea. Humans are flawed, and absolute power corrupts absolutely.