Just because the woman carries the child does not mean that the father does not share a bond with that child, nor have a biological desire to raise it. All evidence points to the contrary, actually, considering the roles of fathers in so many cultures.
Thats a retrospective outlook isn't it? You're entitled to your opinion, of course, but I doubt that men had that much of a role in the upbringing or caring of their children until women received the options of contraception [and abortion]. Now that women have other things to do [and the latitude to do them] naturally, they expect the men to shed traditional roles and split the nurturing with them. The men, as usual, oblige them by transforming their outlook