One way around this is to find some robust metric that most people would agree indicates guilt. One such measure, I believe, would be murder rate. If people in different cultures vary in the guilt they feel for committing murder, then this should hold them back and show up as a variation in the murder rate.
What? Is this an exercise in confounders? Could no longer suspend disbelief after that.
I was following along just fine until:
What? Is this an exercise in confounders? Could no longer suspend disbelief after that.