Then again, we never had a problem with the fandom idea that Kirk grew up without a father before. While it might be that George Kirk Sr. wasn't fated to die in the hands of Nero, it might be that he was fated to die anyway, around that timeframe, and Nero affected nothing much.
If Nero has accurate and authentic intelligence, why would he try and kill Kirk's parents at a timepoint where Kirk himself has already been born? Nero might have aimed at killing little Jimmy specifically, but failed because Jimmy was evacuated from the exploding Kelvin in time. Thus, virtually nothing in Kirk's life changed.
That is, of course there might be a butterfly effect where everything changes because a tiny detail went differently back in the 2230s. But no Trek episode or movie so far has supported the existence of a butterfly effect: the changes are always minor, and only affect the life of a specific person while leaving his or her surroundings basically intact (say, "Tapestry").
Timo Saloniemi