Oh, I thought you were referring to physical disabilities, like all Down-syndrome people, etc.
Well, I've never read of a sociopath who had said, "I was raised in a normal family." I thought this was a really interesting read:
The gene loaded the gun, but the environment pulled the trigger.
This gene-environment interaction helps explain why two siblings with similar genetics can turn out very differently. The child who experiences abuse or neglect while carrying a susceptibility gene faces compounding risk, while the sibling who grows up in a safer environment may never express those traits at all.
- https://scienceinsights.org/is-sociopathy-genetic-nature-nurture-and-the-brain/