If you accept the traditional assumptions of Christianity (well, the ones about “what will happen if I do X,” not about “is X right?”), killing babies is pretty clearly the right thing. And still almost nobody does it, or has any desire to do it.
A just-baptized infant, as far as I know, is pretty much certain to go to Heaven in the end. Whereas if it has time to grow up it has a fair chance of dying in a state of mortal sin and going to Hell. By killing it young you are very likely saving it from approximately infinite suffering, at the price of sending yourself to Hell and making its parents sad. Since you can only go to Hell once, if you kill more than one or two babies then you’re clearly increasing global utility, albeit at great cost to yourself. And yet Christians are not especially likely to kill babies.
If you accept the traditional assumptions of Christianity (well, the ones about “what will happen if I do X,” not about “is X right?”), killing babies is pretty clearly the right thing. And still almost nobody does it, or has any desire to do it.
A just-baptized infant, as far as I know, is pretty much certain to go to Heaven in the end. Whereas if it has time to grow up it has a fair chance of dying in a state of mortal sin and going to Hell. By killing it young you are very likely saving it from approximately infinite suffering, at the price of sending yourself to Hell and making its parents sad. Since you can only go to Hell once, if you kill more than one or two babies then you’re clearly increasing global utility, albeit at great cost to yourself. And yet Christians are not especially likely to kill babies.