To carry on with the FW comparison - the deciding factor was that a properly maintained turbine single engine was much more reliable than a piston twin that couldn't maintain flight on one engine. The statistics backed that up quite clearly.
There are turbine engines that have terrible reliability records, and those that have wonderful ones. Are we going to continue to treat them all the same???
A recent troll through the US NTSB statistics for one popular engine type showed a huge number of unexplained power losses where the engine ran fine afterwards. Can't all be pilot error (as some would claim). This engine type drags down the safety record of all the others, yet we don't do anything about it.