The president and CEO of the 9/11 Memorial & Museum offered a tone-deaf defense of the nonprofit’s extravagant executive salaries this week, as The Post’s Page 1 expose stirred outrage that officials are exploiting the city’s greatest disaster. “Our executive compensation lags well behind that of peer institutions,” Elizabeth Hillman said in an email sent to the foundation’s trustees on Monday, adding that “recent compensation studies have supported adjustments across the organization.” But in the email, obtained by The Post, Hillman did not name any other institutions or cite specific compensation studies. Neither she nor the September 11 National Memorial...