Crab - A night rig departure is conducted over open water starting at a height AMSL of between 50 and 300 feet approx. The risks associated with this procedure are much much less than doing it over land at an unlicensed site.
In addition the potential errors in an offshore departure are captured, documented and trained. The manoeuvre is practised intensively BUT far more important than that is the fact that it is exactly the same procedure in daylight. One procedure, one muscle memory, one picture on the instruments significantly contributing to the success of the procedure.
Please do not compare what happened in this accident to the hundreds of thousands of successful night rig departures each year.
Competence, training and experience. There are no substitutes!