Abortion is clearly wrong.
Abortion isn't a lesser evil, it's a crime. Taking one life to save another, that's what the Mafia does. It's a crime. It's an absolute evil.
The emphasis must be not on the right to abortion but on the right to privacy and reproductive control.
Some forms of motor neuron disease are genetically linked, but I have no indication that my kind is. No other member of my family has had it. But I would be in favour of abortion if there was a high risk.