Yeah, no. You most definitely don't see mentally unwell drug addicts wandering about in Dubai, Mumbai, Singapore, Hanoi or Hong Kong.
Also, let's talk abject poverty and economic disparity. Take a stroll around Mumbai and you'll see human suffering on a scale that will humble you. Try being a migrant construction worker in Dubai - many will call that modern-day slavery.
Also, that's quite a climbdown from your original statement.
You listed several cities, excluding Mumbai, that have some of the harshest drug laws on the planet. And I'd say that the suffering and squalor in Mumbai is more disturbing than a few mentally disturbed individuals on the subway in NYC.
Not sure how you think you're winning here.
If you want to get into a petty argument over details of what I said, then you're missing the point.