African Skies,
You raise an interesting point. The press are in the business of news reporting. It is therefore natural that they speculate as to causes from the very first moment. Accidents and serious incidents to Civil aircraft are often the stuff of headlines. The investigations that lead to the real causes are usually long and painstaking examinations requiring a lot of experts and a lot of study and investigation. For the seriously concerned consumer the only valuable result is the official investigation. For the News consumer the only value lies in the entertainment offered on screen or other preferred media.
I have never seen any evidence of restrictions to speculation here on PPRuNe so there wouldn't appear to be any merit in suggesting that was the case. If you read the title however it is actually the "PROFESSIONAL PILOTS" Rumour network, and so it is not unreasonable to accept that in many such peoples views speculation may be unhelpful in arriving at a conclusion of any meaningful significance.
The site is not generally restricted to any particular group of people and it follows that opininons and comments range from the informed and qualified to the inane and offensive with of course the whole spectrum in between. No doubt all of this will continue but again I can well understand how many aviation professionals would dare to suggest that the real value of information lies in the expert findings and not those of CNN ,Fox news ,sky's man on the scene or even the cut and paste or condolence merchants here on PPRuNe or other bulletin boards.