Captain Robert April wrote:
And that prevents him from choosing to go back intentionally to fix all this....how?
It's simple. Slingshot around the sun to go back to a point before the timeline diverged and prevent the destruction of the Kelvin, presuming that's the focal point in the timeline (another argument), then go back to the point in the timeline before this whole thing started, apparently the destruction of Romulus. Prevent that, or at least mitigate the results somehow, to the point where Nero doesn't go on a time-spanning rampage, and bingo, timeline restored.
But then, JJ wouldn't have his own Star Trek universe to do with what he wants.
If you had seen the movie, you'd know that what you just said is total BS.