I thank Fr. Reese for this insightful column.  I have long wondered why we have built such an enforcement mechanism around this one saying of Jesus while leaving a lot more leeway on things that were clearly much more of a priority in his teaching.  Obviously there was a lot of history involved and for 1000+ years churchmen (yes, men) had governmental responsibilities or quasi-governmental responsibilities to maintain the institutions that should keep society from falling apart.  However, that society has fallen apart, but its canonical legislation survives.  Hence the ongoing need for Aggiornamento, updating.