Short explanation: DemocRats were elected.
The Lindsay yearas were bad. They got Beam, tehn Koch. Even though he was a Democrat, Koch was a pretty good mayor who made progress and made teh city better than Lindsay had had it.
Dinkins utterly wrecked the place. He was followed by Giuliani, the best New York mayor of my lifetime. I have my problems with Bloomberg, but not in terms of keeping order or keeping the city clean.
My view is that Comrade DeBloodio has overplayed his hand, and New Yorkers will react by electing someone sensible who can clean up and keep order. They may be liberals, but they’re not stupid and they’re not suicidal.