All moral codes drill down to a rocky core of "ick," though. Suppose A says, "Well it's clearly wrong." And C says, "No, it's not. Make your case." The case is made when A says, "B inevitably leads to D. Does D make you feel icky?" and C says, "It does."

It's true that people in the past had a lot of icky feelings we don't have today. We also have a lot of icky feelings they didn't have. Given that, I would like to see a follow-up article written about, under this framework, how many more letters of the alphabet have to agree with A before A gets to punish C for making him feel icky, depending on the number of letters in agreement, how severe the ick, that kind of thing.