Re: The Official STAR TREK Grading & Discussion Thread [SPOILERS]
I don't think he ever realized that he was on an alternate timeline. He DID know he had gone back in time. In his mind, by wiping out ALL of the Federation planets (he said he would do this,) he would then have plenty of time (129 years in fact,) to get to Romulus and save them.
So in his mind, he would save his wife and unborn child and his planet, AND make Romulus a great power by knocking out their enemies.
The tragedy for him was that he was on an alternate timeline and he might not even have the wife/unborn child in this reality. Things changed the minute he came through that black hole. All of his revenge might have been for naught. I can't think that just saving Romulus would have been sufficient for him.
Thanks for posting this - I hadn't thought about it from that point of view. I'm so used to the whole "divergent time-lines" concept that I forgot that Nero might well think he can change the past and still have his future.
That makes his actions a lot more understandable.
Space is disease and danger wrapped in darkness and silence - Dr. McCoy
And he says that like it's a bad thing...