I presume there are screaming addicts in all suburbs. The posher the suburb the higher the likelihood they are screaming inside large properties where they are not as noticable. Possibly they are also more likely to get addicted to classier drugs with less adulteration, leading to a lower scream to addict ratio.
A lot fewer, but yeah I does happen. I am also noticing more rough sleepers, more camped vans, and general mental health distress ( not necessary meth heads but people not having a great time of it) round here.
(Source: I live in a previously working class but now posh area. )
Yeah I have seen. And I can't see how it gets better - rents round here have gone from ok to bit pricy to utterly unbelievable in a couple of years (and this was always the affordable side of the city.)