Elon Musk is very likely a supporter of eugenics and since he's also a narcissist who thinks he's better than everyone else, it makes sense that he's obsessed with spreading his genes.

Just remember to conveniently ignore actually raising those kids, and those who happen to not fit his mold of what a person should be like (e.g. if they happen to be trans or see through a modicum of his bullshit)