For the Star Trek question - and I know this isn't a great answer since the movie in and of itself didn't provide it - 1.) He already saw his planet destroyed and people killed and 2.) - this one you find out in deleted scenes - he and his crew spent the time in between George Kirk's death and capturing Spock Prime on Rura Pente, the Klingon prison asteroid from Star Trek VI being tortured for information...ever notice that at least one of his ear points was bitten off?

So the reason he went all Ahab was because he had lost everything, been torturned, and been reduced to a crazy f*ck bent on nothing but revenge on whoever he could dish it out on.  Not a good enough reason?

Why doesn't The Penguin put his time and resources into helping deformed babies?  Because he's a crazy f*ck.

There's plenty of crazy f*cks in sci-fi, fantasy and comic books...I don't see what's so hard to understand.

Wasn't Nero a bit mentally gone by that point?

And maybe the eagles would have gone all "preciousssss" over the ring ...

Trek script timed travel Paradox syndrome I think. or as SC says. Nero = nutter, the Ahab theme does indeed run deep in Trekdom.

 There is no real explanation why Nero didn't save Romulus.  It is a JJ surface film.  What the guy makes.  

 Actually, old Spock just has to tell young Spock exactly how and when to stop the destruction of Romulus. This way, old Spock can be on time to save Romulus and prevent Nero from yada yada yada. Oh, and it still wouldn't prevent Kirk's older brother, Sam, from being born. Which Abrahms and crew left out of the timeline.

Doc tells Marty (in the video) that the car is electrical. The plutonium is just the kick he needs to operate the Flux capacitor.

Lex is always obsessed with beachfront property, and Austraila is the world's largest 'island'.

Qui Gon was a character in a script written by George Lucas. That's pretty much all you need to know to answer that question. RotJ was also more hands on by Lucas after his disappointment of what Empire turned out to be. That explains Anakin.

Not using the eagles is just plain bad writing. Never write an easy solution into your story and then cop out on using it by saying some B.S. that the eagles were out busy having a shag and a smoke or some other stupid excuse.

Flying Ring wraiths would have owned the Eagles taking the ring to Mount Doom.  Two Hobbits are low radar traveling on foot. 

Superman 2: Lex Luthor is the greatest criminal mind of our age. Also, his schemes may have a greater end game than made known. Who's to say that Australia is not perfectly positioned to be top dog within his new world order?

Who says Nero didn't save Romulus?  The destruction doesn't take place for years after the events of ST.  Nero could have sent word to Romulus to take the steps to prevent the catastrophy.  He is bent on revenge and that is what the movie is about.  They may have a throw-away line in a sequel about how Romulus is preparing for the future.

Two theories on Vader: 1) It was the armour that was burned on the pyre.  Vader himself did vanish. 2) Obi-wan and Yoda had time to commune with Qui-gon and learn the new passing therefore that were able to do it immediately.  Anakin had to learn after the fact as Qui-gon did.  None of the other jedi in the Geonosis arena or during Order 66 vanished either.  I lean to #2 as a less contrived feeling explanation.

U smell that? That's some good geekiness in the morning I'll tell ya! And I'm with vitieddie, I wouldn't trust those wacky birds with the ring,, eagles have a superiority complex

As for Star Trek and Nero

The time travel stuff is always funny. But saving his planet in this timeline would not undo what happened in his and that pain can not be erased. He loved his wife not the woman in this timeline.

And even if he didn't think that far along like vitieddie said he was gone mentally, it's all about rage and revenge at this point. He wanted Spock to suffer the same pain not undo his