Al R
While you were leaping to more shotgun-coverage journo bashing (oft but not always deserved) did it occur to you that those who've seen the CCTV footage of Osbaston might have seen the murderer "in a 'frenzied' state" and "'splashing' accelarant" as he made preparations to set the out-buildings ablaze?
Remembering the Mull of Kintyre and some other recent BoI's I'd personally be cautious as to the inevitable reliability of 'process'.
As a general point, however, I would share your distaste for "character assasination by spineless, anonymous wankers on the internet" - though I'd say that speculation that avoids identification or direct criticism of the crew is entirely legitimate on a rumours network.
Expecting everyone to observe purdah until the BoI reports is probably unnecessary and not necessarily desirable.