You're right, I may have exaggerated a little bit. It's not like they will start a nuclear war just to take out James (or any other individual).

What I meant was something like this: we know that "they" have been increasing the tension between North Korea and Japan for years. If they go for full out war and decide to pop some nukes, don't you think that they will try to kill two birds with one stone and land the nuke somewhere where they can take out any persona non grata? I would do it if I were in their place.

And I disagree about them needing us. That may have been true up until a few decades ago, but why exactly do they need me, you or anyone else?

Because of money? But they're the the ones creating money in the first place, they know very well that it has no intrinsic value, they don't care about our money. 

Because of manpower? But robots are way more efficient than humans will ever be. Why would they rely on our work when robots and neural networks exist?

Because they need "human pets" to keep them company? Maybe, but why keep us as pets when they could just genetically engineer the human of their dreams in their labs?

When you look at it from their perspective, there is no reason we "natural" humans should be allowed to continue living on "their" planet.