"We should discourage and disincentivize this thing, it's not good for us and it damages trust for us to see others doing it." "Yeah but one time *you* did it!" "[stunned] Wow...you win. I won't try to push my tainted morals anymore. Now please go hog wild, as is your right."
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in practice this quite often looks a lot like a prisoners dilemma with a reliable defector telling everyone how great cooperating is
This is why, after a lifetime of blunders and escapades, we inculcate innocent youths with the beliefs necessary to argue just as we would but blamelessly.
