Saul Friedman, Newsday, June 26, 2008 Reader Jack Wajda, 69, of Orlando, a retired AT&T executive and financial planner, identifies the single greatest problem with the American health-care system as well as anyone. He writes: "To allow private for-profit insurance companies to decide whether and what type of care we receive is incomprehensible to me." If you've been reading my columns and mail in reaction to what I've written, that private insurers have the power to virtually run American health care is also incomprehensible to most doctors, nurses, technicians, as well as patients. ... The