It is a mess that is for sure and maybe that was why it was never sorted out in the past. With there being that number of members who have their own views the chances are it will be difficult to agree to anything but at least an effort is being made to reach some consensus in order to move forward.
I am not sure a case by case basis is a good idea simply because it invites those that do not deserve it another opportunity to waste time in the hope members here will be engaged in in-fighting. That is just my opinion and it is one of many therefore I invite more participation in this discussion.
Account sellers may have purchased the account for resale and are not tied to the scam, but if an account scammed they fall into the collateral damage category as well. It's the account that gets ruined, the seller themselves may have nothing to do with the scam.
Again, it should be looked at as case by case, if the seller was not in control and didn't do the scam, why tag them? Aside from the fact that people dislike sellers. The account that the scam was done on is what should be tagged.
Its a whole mess of a topic for sure. My mind could be swayed and its a subject that we will never get 50%+ of the masses to agree on.