Because it's cooler to hate murdering Klingon bastards than murdering Romulan bastards?
And I guess because while the Kirk vs. Kruge thing was just personal, Kirk vs. Nero also doomed the guys washing dishes and keeping the inventory straight somewhere in the bowels of the Narada.
And it's never cool to hate. Because in the words of the noted philosopher Dalton, "No one wins in a fight."
I can totally respect this reasoning.
I typed up a debate answer to others, but I'm frankly no good at debating. So I'm not going to try.
In my opinion, Spock was Spock. In my opinion, Kirk was right. In my opinion, it was a good movie.