I snark a lot on canon, EU, and fandom content making a big deal out of Kirk’s son, David Marcus, because Kirk spent MAYBE two weeks with him in his entire life and didn’t raise him at all, didn’t even know him until he was an adult. But I do think it’s understandable that he’d still have emotions about that. The bigger issue is the complete erasure of Carol, who did raise him, was very close to him, and who is never even mentioned in relation to David’s death. It’s not just that we don’t see her, that can be explained by actor availability, time, whatever, but the movies literally never mention her again. The genesis device becomes known entirely as David’s project in Star Trek III even though the implication in Star Trek II is that Carol has been working on it for a very long time and David is sort of her student on it. And even David’s role is framed in terms of Kirk. Carol Marcus doesn’t even merit the manpain of Kirk feeling guilty about getting her son killed, apparently. And we won’t even discuss what JJ Abrams did with her.