I looked at the run/pass play ratio as well PB and I believe you're inadvertently including a field goal, 2 punts and 3 kneel-down victory formation plays as running plays. The presumption that running the ball more precluded the Packers from scoring more in the 2nd half doesn't hold in this case, but for the sake of accuracy the ratio was 11-10. Obviously the 3 kicking plays don't count as runs, and the kneel-downs after the Lions were unable to get the ball back or stop the clock would be misleading to include. It does offer a perspective that coaches espouse more than many fans though.
At the very end of the game when the Packers were in complete control of the score, ball and clock, no one would suggest they should call a pass play under any circumstance at that point. Even handing the ball off would be considered universally stupid. A voluntary 2 yard "loss" and minimizing the chances of loss of possession at that point dominate the "winning" decision criteria. Risk appetite approaches zero as clock, ball and score control approaches 100%. No one would likely argue that.
From those extreme positions on their respective sliding scales then, risk appetite slides up from zero as clock ball and score control slide down. A lot of things impact control of those factors as we know, but McCarthy has proven to have his pulse on the interworking of those factors. He's not perfect. No one is. But he's pretty much proven to be as it gets through exeptional results at the highest level. I'm extremely confident he's forgotten through all his years experience with these situations more than any of us can hope to know. We get uptight and uncertain as games ebb and flow and things sometimes aren't pretty - while McCarthy banks successes closing out games at elite rates.