I think the defense bears its share but certainly blaming the defense as the primary problem is not fair either as a goodly portion of all those points were the result of turnovers keeping Purdue out on the field vs. our D and putting the Defense in a hole so many times. It also fired up Purdue and depressed the Huskers.
As the score got out of line, the offensive playcalling became desperate times call for desperate measures (pass / pass / pass). This gives the opponent even more time to run offensive plays as our offense has terribly short possession times. It was an all around awful game (game plan, play calls, offensive execution, defense scheme and performance, etc.). We should have RUN the ball. This is almost inarguably true. But it is understandable and for many 'conventional' football thinkers, playing behind means throwing the ball. It is not inconceivable that had we had quarter number 5, we would have caught them and won. But too little far too late.