Mitch is not alone. I happened across this commentary by a teacher who tried to teach in a similar situation and quit. In case the link becomes "dead", his name is Matt Roberts, and the story was aired by npr.org.
There are two commentaries on there that you can hear by clicking "listen." The one at the top is him explaining why he quit. The one under a picture with his family is him before he quit, while he still has a little hope.
In case you can't get the link to work, and you don't want to look through archives to find it, here is a paraphrase of the story: Matt and his family (wife and 2 kids) were from New Orleans and they decided to return there to teach after Katrina. He had been a teacher for 7 years. He was eventually overwhelmed at the inability to even teach the high school English class he was employed to teach. The discipline system for these kids was ineffective. The kids who had no desire to learn so that they made learning impossible for those who do want to learn. He said that he was no longer angry at the kids for not wanting to learn, not angry at the parents for not teaching their kids right from wrong, and not angry at the administration for not doing their part to follow through with discipline. He said he was "just plain angry." And tired of excuses.
It is sad how he describes his feelings and he sounds so much like Mitch when I talk to him. :*(