It's his desire to kill and advance the death culture.
If you look at the wives of people like Hugh Finn, Michael Martin and others, they have gone completely waist deep into the culture and are now out there promoting things like organ harvesting from the brain damaged.
Once the spouse gets somewhat interested in killing off a disabled family member, they enter the world of darkness and it completely corrupts them. That's my belief.
I'm not buying that. Even he is not so dumb as to not realize how heinous that would look even to the completely apolitical and amoral crowd.