The problem with your line of thinking is that it places the burden of salvation on the sinner, not on God. Gosnell or whoever doesn’t have to be capable of repentance on their own, because, if it happens, it will happen through the power of God, not through their own efforts. Remember, sometimes God chooses to step in and change the hearts of even the most despicable men, not because they deserve it, but because it demonstrates the glory, mercy, and sovereignty of God.
Thanks for your replies; I didn't see them earlier.
I agree with the above BTW; didn't ever suggest I didn't. It is true, however, that I was not especially mindful of that possibility at the time.
On thinking about it, I also agree that one should pray that God has mercy on their souls -- even if they don't repent.