That isn't true, not by a long shot.  The gray area is the whole reason why scammers aren't banned and DT members have to take care of them with feedback.

I have indeed removed feedback from users when they've proven themselves to be good members of bitcointalk.  It's rare, but it's happened.  I consider people who deal in bitcointalk accounts to be guilty until they prove themselves otherwise.  My thought is that when you are buying an account, you're either going to use it for its reputation to scam, or you're going to use it for its rank to get into a campaign--probably to shitpost with.  Either use is pretty sketchy.  But people have earned positive trust and have proven themselves to NOT be shitposters eventually, and I am willing to give second chances in those instances.  
You don't understand what we're dealing with here.  My inbox is not filled with rational arguments for feedback removal, which I certainly would consider.  It is filled with stuff like the following:
^^Note that I'm not a manager of anything.
^^Note that the "very long ago" part is referring to my feedback being left 2 months prior.And on and on...hopefully you get the picture.  What I'm getting is begging, and these people can barely do this coherently.  

If someone really has a strong argument that I've left feedback in error, they can start up a thread and some community feedback wouldn't hurt.  But if I don't block them?  They will flood my inbox with this gibberish, and there are just too many for me to allow that.

And who is it you think I need to defend my position on each and every feedback to?  If the people in the trust hierarchy think I'm getting it all wrong, they will cast their collective vote and I'll no longer be on DT--it happened before and it could well happen again.  I accept that.  But in the meantime, I think I'm doing a reasonably good job tagging the ones who need to be tagged.Because they haven't earned my distrust.  Lauda & Yahoo62278 definitely have earned my trust, mexxer-2 much less so.  I'd probably leave mexxer-2 a negative for scamming Lutpin if I thought it would make a difference, but it wouldn't.  I'm leaving that entire matter to Lutpin and Lauda, who have already negged him and know far more about what happened or didn't happen than I do.