The owner’s committee volunteered to do stuff in the best interest of all owners. Enforcing by-laws is just one element of that, albeit, a touchy one in many cases. But if they won’t at least attempt to do so you should ask what they are there for. In Qld, an aggrieved owner can route their complaint via the committee and/or go direct to try sort the issue out, or where preferred (or safer) by issuing the relative standard form which then allows involvement of the Commissioner’s Office if thereafter still required (and as I have found, helps informs police in the event the thing might really blow up in the process).
Annoyingly, what I find that some silly committees do is to name and blame the complaining owner over handling the issue discreetly once they have determined there might well be an issue that reasonable needs be corrected.