Sadly in GA the training and procedures that the airline boys have just ain't there - when GA pilots have to deal with an engine failure - they have a better chance of it happening than on an airliner - have less performance - have to do it by themselves - and may not have practised for it for 11 months, and then not in that model or even type of aircraft. IF a pilot is to make a mistake in these circumstances - one has to ask as a 'fallible' human being - is it asking too much to expect someone to perform perfectly - when we have had so little ongoing training to deal with it - when the margins for performance are just so thin ?
Big difference between doing an initial twin in something like a light good condition low time BE58 that goes fine on 1 - do a quick endorsement on a PA31 - do your renewal on a BE58 again - then having an engine failure for real 3 years later on a heavy PA31-350P with 2 tired engines, bad paint and old props ! Imagine in an airline being endorsed on the 737 and 767 - but doing your renewal and engine failures during sim sessions on the 767 but flying the line on the 737 ?
Throw in commercial pressure as dogcharlietree of the boss going off at you because you didn't do what he might have done and you have one situation I wouldn't have wanted to be in !