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Would it be a stretch to add The Addams Family? specifically the Charles Addams comics?
Doesn't this trope not have to be limited to the 'conditioning' being deliberate and designed? In real life (and in a lot of fiction), a person's life experiences condition them to accept horror (or at least not get phased by it). A person who undergoes a Trauma Conga Line is either horribly traumatized or something of a Zen Survivor (or similar). A soldier who doesn't become a Shell-Shocked Veteran after enduring lots of combat has likely found some way to cope with the horror—such as accepting and expecting it. Sometimes that conditioning isn't some deliberate plan or doing, but a side-effect of the actions of an enemy—an invading nation inflicting countless horrors on your people while your country is struggling to stop it.
This discussion from Star Trek is natter, and isn't going anywhere relevant or likely to end:
This was just meaningless, or needlessly ambiguous:
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How well does it match the trope?