Of course you’re right that there are no perfectly clear bright-line rules that would completely fix these problems, the question is whether there is a clear enough rule that would ameliorate the problems. You would have substituted a judgment call on whether all of Said’s comments across the whole site were on net beneficial, with a much easier judgment call on whether a given note is sufficient or not. And whether Said’s comments were net beneficial was evidently such a close call that you dithered about this decision for literal years, which would seem to indicate that a relatively small nudge would have tipped his contributions to the positive side.
Also, if the door to Said changing his behavior was so completely closed, I’m really confused about what all those hundreds of hours were spent on.
I’m still not convinced it’s a good idea to get enlightened, but thanks for the detailed explanation.