That's fine. Kurt Warner can believe that. The same happened to him twice when he lost two Super Bowls while playing for the Rams and Cardinals. During the 2001 Super Bowl loss to rookie Tom Brady and the Patriots (score: 20 - 17), Kurt Warner had no running game help while he only threw for 1 TD and 2 INTs and 1 fumble. His defense held rookie Tom Brady and the Patriots to 20 points, yet veteran and previous SB-winner Kurt Warner was only able to lead his offense to 17 points and a paltry 78.3 passer rating.
https://www.statmuse.com/nfl/ask/patriots-vs-rams-super-bowl-box-score-2001
Similarly happened to him in 2008 when reaching the Super Bowl with the Cardinals but coming up short against the Steelers (score: 27 - 23). Kurt Warner pulled a Dak Prescott from this past January vs Green Bay. Warner threw for 407 yards and 3 TDs but had 1 INT and a measly 33 yards of rushing help from his running backs. Just like Dak, Kurt Warner was unable to lead his team to victory without help from his teammates. His Cardinals were down 27 - 7 in the 4th quarter with Kurt Warner picking up 16 points late in the 4th quarter during garbage time. Sounds exactly like what happened to Dak. I'm pretty sure you and your ilk will complain and twist it around to fit your agenda, eh?
https://www.statmuse.com/nfl/ask/2008-super-bowl
The facts are the facts: Kurt Warner also needed help from his team to win a Super Bowl in 1999 with the Rams where he had no running game help (only 33 yards rushing) even though he threw for 407 yards but only 2 TDs and 0 turnovers, but his defense held the Titans to only 16 points. See how it works? It takes a whole team to step up where different parts help each other to pull a win during the playoffs. A QB can't do it by himself.
https://www.statmuse.com/nfl/ask/1999-super-bowl
Regardless, Kurt Warner still explained what he saw wrong with those 2 INTs this past playoff loss vs Green Bay, and it wasn't totally on Dak.
Let's see how you handle these facts?