It seems that people are getting bogged down with the intricacies of the approach this crew elected to fly.
The fact remains that, with the latitude of operational flexibility that SAR crews are allowed, occasionally poor decisions are made. Mostly, they don't culminate with loss of life. In this case the priority of the investigation is to establish whether this was simply poor decision making or whether there are wider cultural/organisational issues.
Without a doubt there will be some very worthwhile lessons to be learned. Regardless of which aviation world you inhabit.