The Calculus of Blame

In everyday thinking, things you've done on purpose are highly blameworthy, risks you understood but disregarded are less blameworthy, and risks you didn't understand but should have are even less so. On the other side of the equation, risks that you had no reason to understand, or risks so remote that they couldn't have reasonably been avoided, are basically not blameworthy at all. They may have bad effects, but we can round those bad effects down to zero and ignore them. -- Andreas Schou