According to a survey last year, the "proportion of U.S. physicians providing charity care has steadily declined over the past decade,", from 76 to 68 percent of doctors. Chris Rangel (RangelMD) is prompted to observe:
Part of the reason is that there are few if any protections against liability in treating a population that tends to be less healthy, have more bad habits (obesity, smoking, alcohol, drug abuse), and be less compliant with treatment and follow up. Ergo, they are at higher risk of bad outcomes and bad outcomes tend to lead to lawsuits regardless of any actual malpractice. Remember the old medical school adage; "No good deed goes unpunished."