Got to agree with the Senator, yeah I'm convinced he wanted Supes to kill him. That whole "You die or I do" wasn't foreshadowing, it was an invitation. Inside Zod's crazy head, he couldn't just commit suicide (which would have been pretty tough given that he's virtually indestructible on Earth) plus he was born and raised to fight (although obviously not that great at it, as a scientist kicked his ass), but anyway, that was the only option for Zod, to push Supes into killing him.
Before I saw the film, I was all "Superman doesn't KILL !" but when I went and saw it, in the context of the story it made total sense. I have yet to hear a convincing argument on what Superman's alternative was to killing Zod, other than the writers shouldn't have put him in that position in the first place. I suppose with some tinkering to the story, Zod could have been thrown back into the singularity when the rest of the Krypto-trash got sucked in.
So all in all, yeah, Zod had a deathwish. Well that's IMO.
cheers super-fans !