Three times in the 4th quarter......
When we were 13 pts up(to make it a difficult to beat 16 pt lead)....short pass, run, run.
When we were 16 pts up(to force a 3 score lead)....run, run, run.
When we were 16 pts up still(FG missed first time).....run, run, QB run
Though a couple of the earlier red zone attempts were similarly conservative, there is some obvious logic for when it is late in the game and a FG will virtually clinch the victory, that one would wisely call plays that have the minimal chance of turning over the ball.
I am quite surprised that you are arguing against this concept.