I think abortion should be encouraged for these sort of people, albeit very early. Any child under their guidance would suffer immeasurably and compound the same problem.
However, when they cry later on about infertility or cancer (abortion raises risk of both) feel free to be a bit smug about the bed they have made. I’m sure if there is such a thing as a soul, it took its revenge on its ‘mother’. They chose to be childless, it isn’t a decision you can reverse or go back on later. Darwin would’ve had a field day with these people.