Preimplantation Genetic Diagnosis - For 'Disabilities?'

The New York Times just ran an article (Wanting Babies Like Themselves, Some Parents Choose Genetic Defects) that completely blows me away. The topic is preimplantation genetic diagnosis, but rather than the usual 'building the perfect baby' angle the article discusses parents with 'disabilities' who want to leverage the technology to introduce the same conditions into their unborn childern.

Huh?

From the article:
Wanting to have children who follow in one’s footsteps is an understandable desire. But a coming article in the journal Fertility and Sterility offers a fascinating glimpse into how far some parents may go to ensure that their children stay in their world — by intentionally choosing malfunctioning genes that produce disabilities like deafness or dwarfism.

I guess I'd never thought about it applying in that direction. I'd always assumed that a parent with dwafism or deafness wouldn't want their child to experience and grow up with the same condition. I'm curious whether the desire for the child to share the condition is due to an honest belief that their lives were enriched by the condition, or a concern that they wouldn't be able to raise or deal with a child who lacked their 'disability.'

Interesting stuff...