Could it be that the teachers are fleeing a government school system that is guaranteed to fail with these troubled children?
By the way, I will do a Google search on the words KIPP schools and teachers morale. I bet the morale in these schools for the teachers is quite high. Why? Success and systems that work are a morale builders.
See for example this Slate review of the KIPP book Work Hard. Be Nice.
KIPP (Knowledge is Power Program) is "a national network of free, open-enrollment, college-preparatory public schools with a track record of preparing students in underserved communities for success in college and in life. There are currently 66 KIPP schools in 19 states and the District of Columbia serving over 16,000 students."
The reviewer agrees that KIPP works, but largely through self-selection. Families choose KIPP because they are committed to their kid's education. The same kids, with the same families, would probably have succeeded elsewhere.
The review concludes:
"There's something perversely evasive about KIPP's opening up just one school in Dallas, one school in Albany, N.Y., one school in Oakland, Calif., one school in Charlotte, N.C., one school in Nashville, Tenn., and so on—as if the program recognizes that its best chance at success is to be the exception rather than the rule in any city where it operates. Perhaps this approach made sense in the program's early years, when it needed to build credibility and attract financing. But now it has done both. Until KIPP tries to succeed within an entire, single community, it is, for all its remarkable rise and deserved praise, just another model program that has yet to prove it can succeed with all—or even most—disadvantaged children."