Here is the context:
And then there is the argument that using such a destructive weapon was morally reprehensible because it was so destructive as to be qualitatively different from other weapons.
It is from Crash Course US history. It is at 10 minute and 40 second. I cannot see how as to be fits there, and because of it I cannot understand what the host means by the sentence. Does he mean it was so destructive because it was qualitatively different?