there's nothing unsustainable about a 19k/year pension.
right
Evidently, it is unsustainable. The city has approximately $3 billion in unfunded pension obligations. And this ignores completely "other post-employment benefits" for city employees - namely healthcare - which currently has a $6.4 billion shortfall. This is not necessarily unusual, by the way. Many others cities, large and small, have similar deficits.
Part of the problem may be that, "meager" as those annual pensions are, you're eligible for them starting at something like age 55. That usually doesn't happen in the real world. A lot of these people "retire" with full pension and then take a new job.