In truth, this is only unfair if the terms become jumbled.
There are three sets of rights to be considered here. thos of the pregnant woman (later mother), those of the man who got her pregnant (later father) and those of the child. In one situation there are only the first 2 sets to consider. In the second, there are all three.
In the first situation, the we are looking at balancing the rights of the pregnant woman against those of the male who got her pregnant. It is clear to me that the rights of the woman are paramount here.
In the second situation we have the rights of the extant child to be financially supported against the right of the father to have nothing to do with the child. It is no longer a clash beween the rights of the woman & those of the man. Again I feel it is clear that the rights of the child are paramount here.
The two situations are in no way parallels. If a child is created, the father has responsibility for his share of the upkeep, and the rights that go with it. However he does not have any rights of ownership over the woman involved. His rights begin when and if the child exists.
As to his responsibilities, I’m not sure. I don’t know if I think he should be legally liable for a share of the costs of a termination or not.