They looked at the facts and applied the law as it stands.
A cahnce encounter, ends in pregnancy, the woman choses to keep the baby, the man is therfore responsible to support her choice in the matter. Ergo, he must pay, legal confines of the law. Not an opinion or an emotion, common rule of law. Regardless of whether she had said "Oh you don't need a condom, I'm on the pill" or he said "I hate condoms, you're on the pill right?"
Neither is a defence that the law will allow. Nor does the law(to my knowledge) make provisions for accidents, ie condom failure or what have you. Not to mention, it is hardly provable that a woamn had tried to get pregnant by means of deception or malice.
It is hard topic to be sure, but as much as I can see the effects on woman who's lives are for ever changed by it, with the choices at hand(regardless of the hysterics and emotions of abortion, not to anyone in particular) it hardly seems to be a fair law when one of the particapants is ready and the other is not( and it rightly stupid to infer, that then they should not be having sex if they are not ready to commit, catch up to the times, not to anyone in particular), and that effect is compounded by a biased law.