That is certainly valid advice, but again it is reduced to the same problem, it is completely subjective, and if it serves the interest of "forum cops" by increasing their profile and influence then there is an explicit conflict of interest inherent.
"Forum cops" i think thats a good synonym of our DT members, They are here to protect forum users from any kind of posibble scam. By an inclusive DT selection process we submit our vote and choose them to be the guardian of bitcointalk.
But on the other hand if anyone get red trust by any DT members for commiting scam or inspiring others to fraudulent activities start nasty arguments. Its already been a common topics on our forum. Everyday we wasting our valuable time just gossiping on this kind of tagging related argumental thread. We should find a solution.