Surely, you are not referring to the same F-16 which the US Air Force refers to as a "lawn dart" due to its tendency to plunge head first into the ground when it loses its engine.  People speak of the improved reliability of engines in the present, and this is true, but they forget that we intend to field our next generation fighter for 30-40 years.  In that timeframe, a single engine, no matter how well built, becomes increasing more prone to failure.