Good to see some balance in the discussion.
The immediate blaming of the RV pilot by a few posters was appalling, particularly as it was based on so little information. Thankfully, the worst of those comments was modified (to some extent) as a result of the perfectly proper protests which have now also been deleted, having served their purpose.
There is always more to aviation accidents than first appears and, of all the aviation accidents in which I've been involved (professionally) over many years, there has never been just one cause.
FL