Goths aren't "true to seed" in the sense that the biological offspring of two goths do not necessarily grow up to be goth, though inheriting the inclination for it from both parents increases the odds significantly. That is not how goths naturally reproduce.
The process is actually quite sophisticated, and requires the presence of a full-grown goth to trigger it. A pupal-stage proto-goth, at this point completely indistinguishable from any other small human child, only needs to encounter a mature specimen once - and while the initial imprinting that ensues will only take seconds, the incubation period often takes more than a decade, even several.
The first visible step of the transformation is triggered when the dormant goth suddenly gains awareness that they have free will and can do whatever they want with their appearance. While the progress may be gradual, or seem like the transformation happened all at once overnight, the initial seed was planted years ago. And now, in full bloom, a fully-fledged mature adult goth may finally be happy.
And that's why it's important to sometimes look goth as fuck in the grocery store. You might be seen by small child who had previously hoped to die before adulthood because everything they've heard about becoming a grownup is just pure misery, who will then consequently think to themselves "actually nevermind, that's what I want to be when I grow up."
One of the many benefits of being weird in public is possibly saving -- and definitely improving -- a stranger's life without ever knowing.
