The root cause…. For the THIRD time is because leading by 12 points is exactly the same as leading by 13. There is little to zero benefit in kicking 1 point there. The ONLY option is to go for 2 so you lead by 14. If a coach where to kick the 1 pointer in lieu of the 2 point try… I’d seriously question that coaches abilities to make good play calls.
The decision has zero/zip/nada to due with what kind of defense you have. If you cannot grasp that… I can’t help you.