RQ-4: Social code, enforced or evolved ?

Received a mail from a resident voicing the concerns of those who are not blog savvy - some moms and the elderly. The e-mail spoke of a group of youngsters moving about Mantri complex - drenched in colours, and far from sober - hooting and shouting on Holi evening - 8.15-8.30 p m. Later, the group - all boys - was seen leaving our complex in bikes and cars. Outsiders, are they ?
Recently, a 'D' block lift got stuck with two women and an infant inside, one evening. Internal mike/alarm in the lift didn't work. Delayed response,and further time lag in fixing the lift - 30 mins, in all - worked up emotions. The security staff, and PropCare faced the ire of residents; a few of them are said to have shouted at the staff, using abusive words. A security man said he was physically dragged and shouted at.
A while back, residents woke up late in the night,to loud bursting of fire-crackers from a Mantri terrace. It was not Diwali.
Thought of putting together these instances, not to nit-pick or apportion blame, but to engage and interact, online, on social norms that we need to adopt. The relevant by-law of Mantri Synergy Owners Association says, "An owner (or his tenant) shall take care not to cause any excessive noise through the use of musical instrument, radio, television etc as to disturb the peace of co-owners/residents".
Question: Should the social norms we adopt be written into by-laws, or evolved through convention and socially-correct practices.