Blaming the defense for any of this season's failures is simply nonsensical. The Vikings offense consists of the league worst #32 rushing attack by a wide margin of 2.7 ypc and 70 fewer total yards to the #31 Giants' 3.4 ypc. Their passing attack isn't much better at just #25, with a league worst total offense, and just #22 in scoring O. Let's not forget that they had arguably the worst kicking game in the league before cutting Walsh after 9 games after he was missing easy FGs/PATs left and right, and even botched a kickoff.
Meanwhile, the D is #3 in total defense, #2 in points allowed, #3 in passing, and #12 in rushing. Basically, this team is 6-5 with rapidly dissipating playoff hopes despite having the #2 D in points allowed. Yet, you're talking about how the D took a dump in a game where they held Detroit to 13 right up until the end of the game, and the offense turning it over deep in their own territory to give the Lions an easy game ending FG?
Just look at how many points the O put up in the losses: Philly 10-21, Chicago 10-20, Detroit 16-22, Washington 20-26, Detroit 13-16. They didn't even score 3 full TD/PATs worth of points in a single game, and put up sub 14 point games in three of them. The only loss where the offense was respectable was in Washington, but they didn't do anything outside of the second quarter. Now compare that with their wins, where the Vikes scored 22+ in all but 1 of their games where they scored 17 against Green Bay; the offense was actually giving the defense a chance to win games at that point.
This is the NFL in 2016, dude. When your offense is essentially THE worst in the league (injuries or not), no defense is going to carry you to anywhere near a Superbowl title aside from stumbling on a legendary 1985 Bears/2000 Ravens shutdown D and a great kicking game.
relax dude, bottom line is the D has had more than its share of opportunities in both Detroit games to close it out, and in both cases they did not..period. They may be the best part of this team but they aren't that good.