First, I am addressing only cases in which the conception of babies occurred during relations that were consented to by both the mother of the baby and the father of the baby.
Second, when two people create something and one person unilaterally destroys it, the person who unilaterally destroyed it is unilaterally responsible for its destruction.
If a man is supportive of the pregnancy, it is on her hands for sure (and of the doctors doing it). However if the man is not economically supportive, then he at least shares the guilt. Eve handing me the proverbial Apple to eat is no excuse.