"The Colgan crash did not occur as a result of income levels."
Straw man. It was never suggested income levels were the sole cause of the accident. What was stated was that commuting induced fatigue was a contributory factor. The high percentage of commuters at the Newark base, the base of the accident pilots, was a result of the high cost of living in that area, combined with the low wages company pilots received. As stated in the NTSB report.
Further reading:
http://www.nytimes.com/2009/05/14/ny...ilot.html?_r=0