Ewan - I agree, there is no point in getting precious about this incident - most rotary guys and girls have a very good idea what happened and it will hopefully serve as a salutory lesson to us all.
The coroners inquiry will give a verdict but is unlikely to apportion blame and, as you say, such blame would likely serve no purpose (except possibly as a mechanism for further litigation). At least all the families of those involved will hear all the evidence and be able to make their own minds up - I hope they are prepared for some of the journalism that follows though.