Apparently, NASA was aware of the possible tile damage caused by 20 inch long fuel tank insulation foam during launch. So what did they do? They ran computer analysis and concluded that the damage wasn't a danger. Why didn't they send an astronaut out to inspect the left wing directly? If I hear funny noises while I am driving, I stop the car and take a walk around the car. Its common sense. Apparently, NASA prefers to look at the dashboard.