I think the failure to grok stems from you imagining yourself in this position and thinking about how you'd feel instead of imagining other kinds of people and

I think the failure to grok stems from you imagining yourself in this position and thinking about how you'd feel instead of imagining other kinds of people and how they'd feel. If it helps, women tend to think about parenthood differently by nature...probably because their involvement in the act includes giving birth. A woman would likely find it more difficult to maintain that "sperm donor" separation. If the wife of the man is that kind of person, they might find it very hard to imagine the man maintaining separation (much the way you find it hard to imagine not maintaining it). Even meeting once is spending time, attention, and emotional resources. And for the family, even that little bit can be the seed of questions of whether one meeting means there will be more. If I were in the man's position, it wouldn't be worth distress I'd cause. Better to have none than one. However, we're getting into increasingly hypothetical territory. We're doing a lot to assume emotions and motivations on people and assessing their validity. Valid or not, I do see a world where I'd make the same choice this man made, and I wish them the best for it.