Prophecy and precognition rarely end well in fiction, do they?
Tempting as it is to see this as a moral statement about … well, about any number of things … I actually suspect it’s because “she listened to the prophecy and so no pain and suffering whatsoever came to pass” doesn’t make a good story.
I mean, Oedipus could have just taken a no-stabbing-or-marrying-ever vow, too, but where would Greek literature have been then?