Zalt:
This BO105 flight was conducted in accordance with FAR 135.183(d) which, once again, appears to be an alleviation from the fixed wing rule (see the previous discussion on FAR 91.119(d)).
Conclusion; two engines equals twice the probability of an engine failure with the same outcome.
This incident, and the latest B407 accident, both occurred to the same oil company (albeit different divisions). This is not a company which will suffer such incidents/accidents without pressing for an improvement in operational standard (which might translate into equipment and crewing). In the North Sea this has led, in the past, to a change in regulations.
Recent Stats for the GOM (5 year window) appear to indicate that about 50% of all accidents have a primary cause due to human factors and 27% have a primary technical cause; 17% of all fatal accidents have an engine related cause and 23% are flights into water (which may have been CFIT); 7% of of the single engine accidents were at night.
(The only engine failure on a twin leading to an accident was multi-cause - tail rotor failure.)
All accidents for the last three years were single-engine, single-pilot.
Draw your own conclusions.