Yes I know. In your eyes the defense is not required to do their job at all unless the other team starts inside their own 10. The offense is expected to perform from their own 5 yd line and score - but not the defense. Nope buddy. They are only required to do their job if all the stars align in their favor lol
If you give your defense a 28-6 lead to start the 3rd quarter - and then are given another 6 points to add to that - if it comes down to a goal line stand - your defense has failed. You can blame coaching, players, whomever you like - but it is defensive fail with only 2 exceptions. If there is a pick 6 or there is a fumble in the end zone.
If your defense allows 31 pts in the 2nd half - or 21 pts in the 4th quarter - to blow a significant lead - that is a defensive failure. Offenses are going to become more conservative with such a lead and concentrate more on running out clock - that is just fact. Why do they do that? Oh that's right - because they expect that a defense can hold such a significant lead.