True enough, unless the object hit was as fragile as an egg. I've read that previous NASA workups involved a piece of "foam" weighing 3 - 5 ounces. This piece weighed about 1350 "ounces". That puts it a few ounces outside the envelope, to say the least. Have you seen the video? It hits the inboard wing root and "puverizes" sending fragments all the way out to the wingtip. NASA assumes the strike was from fuel tank insulating foam. It could also have been ice.
NASA screwed up. They rolled the dice, and some folks lost their lives. Taxpayers lost a few billion dollars. Some folks at NASA should lose their job.