It has been statistically proven that accidents don't happen because of ONE contributing factor, they didn't die from cold water, they didn't die from a stuck anchor, they didn't die from high seas, they didn't sign their death warrants when they left the dock, they died from a combination of those factors! The plane crash in Buffalo happened because the pilots had the plane on auto-pilot and they had bad icing, the plane may have been improperly loaded, that hasn't came out yet. Car accidents are almost always a combination of factors- excessive speed, driver distracted, alcohol, sun glare, driving too fast for conditions, I could go on but you get my drift?