like most of fel's stories, racism is a subplot, there's absolutely no need to put the word in bold, also, in this case, it doesn't apply.
Killing the chinese hackers is
specieism at best, which, from a biological perspective is completely different. You could almost compare it to putting down a dog that attacked a child. To dragons humans are no more then pets. Is this right? No, obviously not, but that does not make kell a morally bankrupt monster.
don't apply human morals to dragons
Kell is a dragon, he isn't people, all dragons could very well be psychopathic compared to the average human, they sure seem to have the arrogance and detached emotions. That doesn't make them evil. And if it does i'd like to come live in your happy little black and white world, it seems quite lovely there.
(might i add that american law allows you to shoot someone on your property in self defense, an argument could be made that, if hackers found proof for the presence of dragons any number of negative situations could arise for the entire dragon population.)
The fact that the hacker is chinese is irrelevant, the fact is that china is a highly competitive nation that is economically at odds with the nation the author lives in. It wouldn't matter to me if it were a belgian software engineer or a brazillian script kiddie, his intellect is the part that's dangerous, not his skin color.
also, if a hacker actually penetrated their security, he'd find a custom os, with a completely unknown language operating on highly advanced unknown hardware, including displaydrivers for a thermal screen and draconic-english translation software, in the internet search history of those machines that hacker would find searches for information on dragons and magic but ignoring fantasy sites (even when carefully whiped there's always a bit of cache while you're browsing). And those are just the dragon internet search machines.
The earth bond universe does seem to have 3 possible conclusions.
*The dragons take what they want and give what they want... behaving somewhat like royalty.
*They set up trade relations and everyone sticks to some ground rules (eg, dragons acknowledging human rights, the us and china doing the same thing and humanity acknowledges draconic rights [privacy seems an important one here])
*open war