(a) I lump MythBusters in the "not-very-rigorously-done-but-definitely-for-popular-entertainment-consumption" class of investigative authorities
(b) we had a case in Oz, not all that long ago, where a surgical patient died as a result of oxygen igniting a (presumably synthetic) stent in the trachea .. same sort of consideration
(c) most of us have seen various training films (or demonstrations) wherein an oxygen stream ignites a flammable substance without any external ignition
I think the earlier comment I was very surpised, it had never crossed my mind is pertinent for most folks.
Russian Roulette probably is an apt term to apply to careless use of oxygen ....