MY personal reference to it being a bad decision stands based on the the alleged reason being that this major international airfield with approaches and long runways was "ufamiliar."
Yes there may be other facts, yes there may be weather enroute - and if so maybe it was a decent decision. But the reason stated earlier was that he just didnt want to go to Manilla because he was unfamiliar - and if that is the reason, then he sorely needs more training.