Oh man, you have to read this.
It's the Onion at its best: using thinly-veined satire and sarcasm to expose the ugly truth. Because really, every thing in that article IS true. I have had almost all of those thoughts, and I've heard it from many of my compatriots, idealistic corps members or not. Except TFA/NYCTF isn't responsible, exactly; it really is the cities and the systems. They suck you in and then suck out your energy and drive and will.
I've only survived on stubbornness and a little bit of grit. Idealism went out the window way before I stepped foot in my own classroom. Optimism and idealism are for pansy-asses.
Harsh but true. Other urban (and maybe even suburban and rural?) teachers will back me up on this.