Too early to tell the probable cause but it puts the spotlight back on Robinson. That is the second high profile heli operator family to lose a son. I am sure Louisa Patterson will be following this investigation closely.
In some respects the R22 (and lesser extent the R44) get a bum rap as the former is predominately a trainer aircraft or privately owned and therefore more likely to be mishandled and the latter is a commercial entry level machine prior to operating turbines. It could be argued that this being the case the aircraft should be built to better withstand this sort of mishandling. I'm not sure about the Robbie tri hinge teetering head design and I know it has come in for much criticism.
I met Frank Robinson a few times. He used to regularly have breakfast at our crew hotel in Torrance. Back then he was amazed at what we were doing with his machine although I think in the latter years he may have been more concerned than amazed.
That said they can be very useful......