Arrogance? I don't know about SP obviously because I don't know the approach she's going to take, but why should this case be the only one the public can't write/broadcast about?
By the end of March it's pretty much four years since the British police got involved. It's perfectly legitimate to ask questions about that, and about the still unsolved case. There is public interest in both.
Under normal circumstances the police do try to keep the British public informed; in this particular case Portuguese secrecy laws apply ... and this is a Portuguese led case.
Are you suggesting that the public should have their questions answered at risk of alienating the Portuguese authorities and lose any hope of continuing the co-operation which may solve Madeleine's case?
Bear in mind ... we were warned in no uncertain terms at the beginning of this investigation what the expectations are ... I think the police should be left to get on with it and if they find anything worthwhile in the Poulton documentary, I am sure they will be appropriately grateful.