The truth is complex and not nearly as dazzling as painting people as "grifters" in a broad stroke of the brush. I left a couple of years ago, when faculty were forced to teach 40+ students, endure extraordinary commutes for 5 or even fewer students on-site.
I saw in my time (nearly a decade) a school actually trying to be an educational experience with good faculty committed to teaching to their best abilities. Beginning in 2012 with declining enrollments, the school shifted to meeting the business requirement of profits, and lost sight of faculty and students.
As more and more students were shoved down fewer and fewer faculty throats; as the DeVry culture became increasingly predatory--both institutionally and among students; as students with low or no skills were expected to be "persisted," many of them riding their grants and loans as a financial plan; as more and more "service" was heaped upon dwindling faculty numbers; the school eroded into a degree mill.
Higher education everywhere faces these issues, by the way; they are not unique to DeVry. However, they are egregious and pronounced at DeVry and among the for-profit sector schools in ways that are still more subtle in traditional schools.
As for remaining faculty: I understand why they stay--some are in their 50s or 60s, they have kids, mortgages, bills. They cannot afford lofty and noble principles. It's a job. And if they can do some few students some little good, they feed their souls those morsels.