Over at Triablogue I'm having an interesting back-and-forth with Steve Hays, who has proposed that it would be moral for doctors actively to kill jihadis who are injured and to harvest their organs to help their victims. He also appears to think that it would be moral for a fireman who knows that Himmler will grow up to commit genocide to refrain deliberately from rescuing Himmler from a fire as a young child in order to prevent his later evil actions.
That is the general context of the debate. It's gone through several posts. Links, starting with Steve's post to which I responded and going in order from there, are here, here, here, and here. I think that's all of them. Readers may want to follow along. That's been much of my blogging time lately.