Gnostic, first, whilst these are professional sports that does not make them an identical workplace to any other organisation. Second, it is not uncommon if all other avenues have been explored, short of sacking, to publicly chastise/criticise a worker/player. A written warning that deplorable defence is unacceptable conduct and any further incidence will result in your sacking does NOT help a footballer. In this instance, it is entirely possible that with considerable misgivings within the camp the only option Deans had to prevent morale dropping further was public criticism.
It is also possible that he gauged that with this individual, the strongest boost and focus would come from extrinsic pressure.
I don't think anyone has questioned the truthfulness of the comments, or that QC (Quade Cooper) has issues in that department.
You agree with Deans' assertion that Cooper has to improve his defence "to be considered as a long term prospect" yet still somehow Deans is creating a diversion? I really do hope your shrink knows how paranoid you are.
We don't know the individuals, we don't know the camp, we don't know what management style works best. We can only judge abstractly from the side - based on RESULTS. So let's sit down at the end of the tour and decide whether or not it was appropriate to bollock a player in front of the media, based on results.