I maintain it makes zero sense that Nero plots to destroy Earth and the Federation because the friendly Vulcan that went out of his way to help Romulus arrived a bit too late.
The plot definitely would have made more sense if the Federation actually was the cause of the star blowing up and the death of the miner's families. Something like Starfleet was trying to stabilize a star inside the Empire and it went all wrong.
Now, a villain like him in a movie where the seven are a crew and more established (like in "Into Darkness") would be indeed terrible. I'll bet credits to navy beans we don't have to worry about that, though.
I'll take that bet. For the movie's villain, we're going to get yet another mentally unbalanced individual, who blames the Federation for something that happen to him, and feels justified in seeking some form of revenge.
Of course if that not essentially the (tired old) plot of the next movie, I'll apologize.