Ah, you interpreted cookiecaper as saying "this problem doesn't happen, period". In which case, your response makes sense - "of course it happens in these parts of SF under discussion".

I read that comment as more narrowly disputing "most mid to large size American cities have it". Revisiting, I do think my initial reading was correct. If cookiecaper was denying the problem existed, why would imagining it be "a nice way to comfort yourself about living [...] in either SF or Oakland"? The comment makes substantially more sense as asserting that 1) the problems in SF are not problems elsewhere, and 2) a view that they are problems everywhere (and thus maybe not solvable) is not reality based, so SF and Oakland must be "Doing It Wrong". I don't agree with that comment - as you can see from my direct response to it - but the logic of it is coherent in a way it would not be if it were supporting the other point.