For those jumping the gun and calling for the NVFR to be scraped (or state it shouldn't exist)
This accident has nothing to do with NVFR. It would be the same as saying IFR shouldn't exist because somebody in a metro flew into a hill..
Not all flying conditions suit all flights. Forecasts whilst not bad, can be wrong. This accident may not even be related to NVFR.
If you are so convinced NVFR is so bad, climb out of your turbine multi, climb into a piston single and go for a night flight in good conditions. It can be very enjoyable.
Weather permitting I would prefer to be NVFR than IFR (at night) There is generally more light outside the cloud.