Hm,
So what about the case of the police Twin Squirrell which crashed onto the roof of a house at night in South Wales a few years ago? It could so easily have been a major disaster and the number of engines would have made no difference. I have no access to the statistics, but I seem to remember that at least 3 twin-engined police helicopters in UK in the last 20 years have suffered tail rotor failures of one sort or another. How many have suffered a single failure during that time? I'm sure one of you PPRuNers will have the answer
