Well, that’s not entirely fair. That foam is impacting the shuttle while it is traveling faster than the speed of sound. Even the lowest mass objects have a great deal of energy at these velocities. Simultaneously, this was not the only instance of a foam impact. When they reviewed footage from previous launches, they found evidence of impacts in a large number of them — but only one resulted in an accident.
This doesn’t excuse the failure, but you can’t claim that it wasn’t a freak accident either.