"Why waste your time pissing against the wind?"

well, then you can complain.."My God...I'm getting drenched in piss!"

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"... if management hasn't ever effectively enforced the current rules, ..."
The point has been made before that enforcement requires knowing what is happening...THAT requires either someone(s) with moderator status reading everything, or having problems reported...then sorting out whether the rules have, in fact been abused (often a grey area).

Membership would 'improve' control simply by having fewer abuses when folks know their membership might be in jeopardy...(and knowing that PMs are available to those they offend.)

Nothing can totally eliminate human weakness & temper tantrums and bad taste...but accountability can make some think twice.