Seriously. I'm not sure what is so difficult to understand. Belichick has a system and it is the most successful system in the history of the NFL. This does not make the system perfect or even the best for everyone, but it is undoubtedly the most successful and it is focused on playing a long game that is not reactionary. Part of that system is an adherence to rules that underpin the foundation of the system. If those rules are broken, there are consequences. There is no waiving of the rules. For some people, the ends will always justify the means in waiving of these rules. But this has never been Belichick's way. He asks players to make sacrifices others do not have to make in order to be a part of the most successful system.This betrays a stunning lack of understanding of why Belichick has been so successful for so long.
This isn't that complicated and even a cursory understanding of Belichick's upbringing would point to why he is this why and where he gets these ideas from.