Why the bulletin?
Bulletins are routine now. They are preliminary factual reports. They contain facts as established from the FDR/CVR and leave it at that. Lots of "what happened", but no "why it happened", because the latter will not be established for some time yet.
Why post them? It's an insult to the aviation community's - and the public's - intelligence to withhold facts from them once the facts are established. It's the truth, even if it's not the whole truth. Truth, even part of it, tends to limit speculation; but nothing - even silence - will ever stop it.
I'm with StarbucksOne: "If a discussion on this topic becomes "taboo", you might as well go and delete most of all the other threads on pprune. The flyBe GPWS incident is a good example. I've read enough on that thread to make me think twice on travelling with flyBe and am glad I did. I can make my own decision about the credibility of a post."