In the film "Mrs Brown", about Queen Victoria, someone asked why the Queen continued to grieve so excessively for so long after her husband's death to the nation's detriment, the answer was "because no-one has told her not to". It was in a film, so it must be true.
To answer Mars' question, it may be that this pilot was in the habit of coming in fast with the tail down, had done it for years and gotten away with it, nobody told him it was a bad technique. One time his luck ran out.
This is why Flight Data Monitoring is such a good thing. It allows people's bad techniques to be fed back to them (in a nice way of course) before disaster strikes. Once told, most helicopter pilots will take the necessary steps to correct their technique. A few will resent it but even for them, resentment is better than death.
Or maybe he was just having a bad day - never mind, I thought it was time for a plug for FDM ( he said to appease the inevitable outcry)