I'd be interested to know what the actual stats are for causes of power line accidents. Because if 20% are engine failure and 80% are 'other' - then even if all engine failure crashes were 'saved' by a second engine, the overall safety would only increase by 25%. But the cost would triple.
If insurance covers the difference and the flights are generally operated in remote locations by willing pilots - then who cares? Why not put safety third for once 😜