That's the thing.
But still there are some issue. Let's say someone neg tagged an account for things which doesn’t actually warrant a negative. How can the user get out of that tag? To PM the feedback sender? Sometimes some DT members are so irresponsible that they don't care.
The point is unless another DT member acts against that feedback, nothing happen in some cases. So, in such cases, the tagged user are carrying the feedback without doing anything wrong.
Now, if a DT member positive tag the account as counter feedback (which is wrong again but to let other users that the previous feedback isn’t appropriate), something can be done to remove the neg tag. I think this is good for this approach.