I rewatched the scene before I posted. Again, McCoy NODS before he responds to Spock. His tone is also perfectly cordial. He doesn't get cross until Spock attributes the war to the entire human race rather just a rogue group of scientists. McCoy isn't correcting Spock, he's expanding on his statement. And Spock then acknowledges that Earth's last World War was also known by the name "The Eugenics Wars."
Except in-universe, where he
is contradicting Spock, cordially, because the two are friends.
Not that Spock would need to be utterly wrong. He may be speaking from a Vulcan viewpoint, and will learn better by the time of "Bread and Circuses". But he's wrong about the Eugenics War(s!) being the same as the last World War, in-universe - that isn't a viewpoint issue but an outright contradiction of known pseudo-facts. And there's nothing wrong with him being wrong. Everybody is, at one point or another - and intriguingly, everybody is, in the teaser for "Space Seed".
I really think that the TNG era retcon that the Eugenics Wars and WWIII were two different events is warping people's perceptions here, and you're seeing what you want to see.
And? Of course we're seeing what we want to see. That's why we watch, instead of turning off the telly.
Spock is wrong because the writers were wrong. In this particular case, they weren't wrong because they were stupid (unlike, say, when they make Spock say idiotic things in "DDM" or the like), but simply because they didn't know better. We have no reason for caring; writers are just tools for giving us what we want to see.
When TOS was made, they were intended as one & the same thing.
You mean when "Space Seed" was made? "TOS" isn't a thing: by the time of "Bread and Circuses", they wouldn't have given a flying fuck about "Space Seed". It was a whole different universe in that episode, not even bothering to retcon that which theoretically came before, in that another universe with some similarly named characters .
That part, creating actual continuity retroactively, indeed came later, when continuity became a thing.
And if the Eugenics Wars weren't meant to be the last of Earth's World Wars... Why even bother introducing that element? Why confuse your audience with extra fictional history that isn't even relevant to the plot? What possible benefit does that serve?
What possible relevance would that whole DY-500 vs DY-100 thing have? It's all meaningless make-believe to create a mood.
However, it
is an interesting point inside the dwarf universe of "Space Seed": would there be significance to all war ceasing to be after Khan's nastiness? Is this "end of all wars" the reason Earth would have been so prone to collapsing were Khan's survival made public?
Here, Spock may speak of Earth finally learning not to wage war. But in "Bread", he rattles off figures of three world wars and then asks "Need I go on?", as if he could proceed through WWIV and WWV to WWVI. Elsewhere in Trek, Khan isn't the final entry in lists of bad guys: we get sequels by Li Quan and Colonel Green at least. The dwarf universe of "Space Seed" doesn't survive in the wild without adapting and bowing to general continuity. And I don't see much dramatic significance to the possibility that Earth stopped fighting altogether after Khan, either within the episode or within Star Trek.
Timo Saloniemi