That's exactly my point: Kirk didn't wrong him at all. Some might argue that he did, but I don't see it. Khan was an idiot. That's all there is to it.
Initially, yes, Khan was the aggressor. But it's not as if he tried destroying Earth as his first goal. He just had delusions of grandeur and desires for authority. When he failed in commandeering a ship (a far cry from multigenocide) and was defeated by Kirk, he was exiled. Because Kirk defeated him, he had some animosity towards him, and this was amplified by the fact that no one ever checked in on them. He felt as if they were left to die, not to survive.
You can't say the same for Nero because he is the shade of black. There is no shade of gray, there is not even a semblance of sanity, and his story is totally glossed over if he did have these things. The point is that they needed to expand upon it and make it more reasonable. This wasn't impossible to do.
But use Khan to prove that Nero had no motivation is faulty logic.
Agreed. But I never brought up Khan in the first place, you did. And I've seen other posts in the other several Nero threads where you essentially lash out at a few other Trek villains just to exonerate Nero.
From a totally neutral standpoint, I believe Nero to not have been given the proper time to develop, and because of that shortcoming, I find his motives to be strange. I'm not comparing him to previous villains, but just my own idea of what a villain should be. If you want to say Khan or Chang or anyone else wasn't a good villain, fine. That doesn't change the fact that Nero wasn't good either.