I have never understood this, or Marriott's defense that as owners the group has every right to be there doing what they're doing. It's preposterous.
Look through the governing docs for your resorts. There are myriad sections detailing what actions Marriott can take if the various common courtesy rules are not followed. There IS language which supports Marriott not allowing owners the use of their ownership if any owners/guests are negatively affected by others. In drastic cases there are allowances for suspending ownership.
I also don't understand minimizing this group's actions to only common courtesy infractions, "unruly children" or "children swimming without supervision." This group is required to put up a surety bond to cover damages, extra security and cleaning personnel, and compensation that Marriott pays out to owners/guests who can legitimately document that their vacations have been ruined. Do we know of any other situation where a surety bond is required?! No! This isn't a matter of a large group being insular and other owners/guests being made to feel they're outsiders. It's much more than that, and the governing docs do give Marriott the power to stop it. Why they don't is a mystery, although probably their financial gain is a factor.