"I wondered if it played better to their home audience . . ."
I suspect it did. Someone from an Australian organisation was recommending they (DJs) get counselling ASAP because of the death threats etc. Various Australians commenting on the BBC or reported in the UK are (quite reasonably) wanting to remind the public that the outcome could not be forecast and the DJs have feelings. Seems maybe some in Australia are playing down the distress of the family of this nurse, which is where we may be concentrating our thoughts.
No, the DJs should not be hounded or get death threats. Yes, they did something rotten, but in line with 'radio pranks' (perhaps a bit wilder in Australia than we have in UK?) but at the same time with the high profile of the Royal family here (and in many commonwealth countries) surely knew the fallout would be career changing for the nurses - yet is seems the career changing they were thinking about was their own, as they became (in)famous overnight, for this call.
Someone earlier seemed to blame the hospital more than the radio station. I find that awful and wrong. Yes, the hospital was not blameless, and should have taken measures to deflect the media. However the radio station could have taken a different approach and reported only on the fact they did talk to staff (without airing the whole tape).
The security lapse was enough to get staff disciplined (whatever they are saying now) and given shifts etc, the radio station, after failing to get to speak to the nurses for permission (said to have tried 5 times) should have given up on airing the call, and could have done the responsible thing and spoken to senior management in the hospital [without saying when the call was made, thus reducing chance of dismissals/disciplinary proceedings against the nurses]. It may be that dozens of stations tried to get through and only the regular switchboard staff knew of the numbers, but nurses were clearly not prepared for this.