I have other pro-choice friends who tell me stories of their sister or cousin who often wonder what it would be like if they kept their kid and are haunted by what it would be like "she would be 8 years old today" and when they cross the street they wonder what it would be like to hold that hand.
This isn't an abortion exclusive feeling to have though. When people make major life decisions, it's commonplace to second guess them, even if they were the right choice to make.
I'm childless by choice. But I often wonder what it would like if I had children. Every time one of my cousins or friends have babies, and I hold them, I wonder what it would be like if it were my child instead of theirs. I feel guilt over the fact that I know my parents, particularly my father, is saddened by the fact I haven't given them grandchildren. I'm still young enough now to still have them if I change my mind, and I worry that if I don't have kids now, I'll come to regret it later, when it's too late.
When you make most major decisions, there's a pro and a con list for each decision you can make, and it's expected to have some doubts about the choice you made. You can spend your whole life questioning your career choice, spouse choice, choice to get married or stay single, etc. After I had a pregnancy scare myself last month (I am on birth control, but my husband and I had already decided previously that if I were to become accidentally pregnant, we would keep it), I had more than the usual feelings of doubt regarding not having kids. But I still feel like these negative emotions are preferable to what I would be going through if I had in fact been pregnant, in terms of a pregnancy's effect on my financial security, education, career, standard of living, marriage, community involvement, and overall happiness.
Likewise Bob had previously stated that FHA was giving up a potential chance for happiness with their child, or could be keeping from being born someone who would make great contributions to society. True, that could be the case, but FHA was just as "guilty" of that just by not having kids period, before a pregnancy even occured. The same reasoning could even be applied to parents with children. You only had four kids? How do you know the fifth wouldn't have been the next Einstein or Mozart? Or maybe FHA himself will make some great contribution to society that he would be unable to achieve if he were a parent.