Most likely did not want to go missed, that would mean flying back up into bad (thunderstorms) weather. Sorta reminds me of Air France in CYYZ.
Looking at the METAR, I cant help but think that these guys should not have been there in the first place.
Very good point. Too often we've seen pilots continue approaches with nasty weather sitting off the far end of the runway, seemingly unconcerned about what could happen should they need to go around for some reason. Much like flying into a box canyon.