IMHO I believe more good than harm can come from speculating as to the cause of an accident. Talking through potential scenarios, lethal or otherwise will spread knowledge and experience.
What else can we do when we hear of an accident except offer our 'cyber' condolences until the AAIB report is published and say 'oh right, that was it then. .'
Anyway, isn't it up to the moderators to say what goes on these forums. . .?