For those posting about wanting the name being publicly posted, I understand your points of view.
Putting on my mod hat: In the past, the site as a whole
(previous mods and the current ones) have been hesitant to allow people in these situations to be publicly IDed, especially if the transaction really had nothing to do with DPF, as should there be an issue with the IDing or something similar, it does open the site to "issues". Now, what might be said via PM, we have no control over it, so if people want to discuss the issue in detail via PM, that is up to them.
However, I would like to think we are open minded about the issue and the needs of DPFers, because I agree with everything said above as a collector. I know other sites that deal with collecting items have ways to post a bad trader/bad seller list that is strictly under the control of the mods/admin. Now that we are discussing this internally, let us see if we can implement something similar.
Edit: Doc posted while I was mulling my answer:
Not a slippery slope at all. As a community we owe it to each other to let others know when there is a person that is causing issues. I think we are giving to many chances to several people who have proven in the past to be problems. We have the right to know who to watch out for!
On a collector level, you are 110% right, it is not a slippery slope. Trying to look out for the well being of the site and all it's members, yes it is. An example: Let's say someone posted the same exact thing, but they were slightly off on the name they posted, or because they heard it second/third hand, it is inaccurate. Because it is has been publicly posted, if the site allows it to remain we are "promoting" the falsehood.