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Since the root cause was cloning and their genes being messed with, I'd look toward Designer Babies for the general concept.
The "accidental" part could be a dash of Gone Horribly Wrong in the sense of "I'm just going to do a little cloning" or "I'm just going to do a little genetic tampering", and a singular error has dire consequences.
This is the "nature wins" side of Nature Versus Nurture. Note that tropes like Villainous Lineage and In the Blood do, however, include examples where there's no specific relative they take after, but it's instead a generalized inheritance thing- say, in an Urban Fantasy setting, Orcs have known sets of genes that relate to their aggression and impulsiveness, and those with even distant orc ancestry often struggle with both actual Enemy Within issues as these genes express themselves and accusations that their "orc blood" is showing when justifiably angered.
Clone Degeneration for the aspect where it's caused by an issue in the cloning process
Strictly speaking, "evil" is more abstract than "sociopathy". I'm saying this because I see you throwing the word "evil" nilly-willy
There are reports that sociopathic tendencies IRL can be caused by some rare genetic mutations, but in general there's no "normal gene that causes sociopathy"
There was a "born evil" trope in TLP a few months ago but I'm not sure what happened to that.
This is mainly related to Resident Evil: Code: Veronica. I added a new entry for Villainous Lineage, but I'm not satisfied with it as it doesn't really seem to 'fit'.
The context: The primary villains are twin clones who exhibit extreme sociopathic and narcissistic traits. But these were not because of the person or lineage they were cloned from, their creator had accidentally triggered the genes that would lead them to develop antisocial/sociopathic personality traits.
In other words, they were born with predisposition to the traits seen as 'evil' due to a mechanical mistake in their creation, leading them to literally be 'born evil'.
I don't think Freudian Excuse fits either cos that seems more related to traumatic experiences. The tropes like In the Blood or Inbred and Evil all point to inheriting the traits naturally, but this is the opposite. I guess I can cite those and say it's inverted, but I'd rather find an actual trope that emphasizes "They were literally born with all the sociopathic traits, and couldn't have turned out NOT evil without a lot of effort." or something like that, and doesn't mention it's hereditary or something inherited from someone else etc. A generic trope for 'born evil' so it can apply to this case where that's just literally what happened, and has nothing to do with bloodline.
Edited by Elementroar