A Vulcan stranger arrives a few seconds too late to save Nero's wife's life. So Nero destroys the USS Kelvin for not knowing where Future Spock is (???), waits 25 years (????), chucks Spock on an ice planet, blows up Vulcan, and then plots to blow up Earth (???????).
WHAT. I DON'T EVEN.
Yeah, that's Nero's motivation and actions through the film. Why the question marks? You do understand the idea that tragic events do lead to extreme actions and the desire for revenge directed at the person you feel is responsible.