Your suggestion is that people experiencing antisocial behaviour that affects their health and wellbeing should just move to a new house? Where the same thing can easily happen again? And that we, as a society, should do absolutely nothing else about it?
Deranged take, worthy of a ‘libertarian’ teenager.
Sets are super useful for all sorts of stuff where you want the datatype to guarantee there is only one instance of a value in the collection. UI components where you are incrementally adding things to a selection is a great example.
It’s a completely standard feature in many stdlibs and has nothing to with turning JS into a database.