In context of this community, I personally feel it's intentionally-basic ground rule to keep healthy relationships with other people over the argument
I feel admins don't want to be overly prescriptive how you "suppose to" act but in every heated/controversial discussion they will try to keep peace/civility at the expense of "the truth"
Of course, this approach has its cons but one can always stroll to the instances with fewer/no ground rules while keeping your beehome clean and friendly