Doctorate work is supposed to be difficult, and that's part of why it is the pinnacle of academic achievement.
The only responsible course of action they could have taken was to strip him of his credentials. They didn't do that, so one must naturally question every single doctorate they hand out.
Perhaps it doesn't matter to some that they hand out PhD's in the bottom of Cracker Jack boxes, but this is a serious issue that shouldn't be taken lightly.