>The one thing few of them understand and truly take to heart is that nearly all rules allow for exceptions to be made.
"nearly all"
This misses the mark. This is like saying "few of them understand and truly take to heart is that nearly all possible bullet trajectories allow for life to continue"….it's the ones that go into a person's head that exceptions can't be made.
It is much more relevant to speak of rules where exceptions cannot be made. For example:
If P, then P or Q.