Few people have died because of a single engine failure in a twin, and most of those died because one of the pilots pulled off the good engine. Happened in China in an S76. But given reasonably proficient pilots, people don't die from an engine failure, and seldom injured. A few more in singles, of course, but even then an engine failure should be survivable. I've been a pilot since 1968, and have yet to experience an engine failure. I worry most about what is the most likely thing to happen and hurt me, and engine failure is way down the list. I'm not thrilled by vertical takeoffs in the middle of the night from a highway or field in a single, but I do them, because the more likely killer is hitting wires that I can't see. I mitigate the most likely catastrophes in the order I think they are likely to occur, and engine failure isn't in the top ten.