Please go ahead and add your groundless speculation. (I just added a couple more of my own to the post.) I'm actually more interested in the set of plausible explanations, than the actual explanations. A possible explanation for an error can perhaps teach us something, even if it wasn't the one responsible for it in this world.

For example, "The authors were trying to solve one particular case of time inconsistency." suggests that maybe we shouldn't try to solve ethical dilemmas one at a time, but accumulate as many of them as we can without proposing any solutions, and then see if there is a single solution to all of them.