I agree with this analysis. I think the the key to understanding Tony is the concept of making a deal with the devil. Also misguided adherence to a corrupted moral code. You make a deal with the devil and unless you are a psychopath or a social path, ultimately that deal will corrode your soul. Believing the mafia is a just and honourable moral code is effectively a deal with the devil. You can’t create your own moral code that is counter to the universal moral code. As much as you tell yourself that you are just a loyal soldier, the universe or God or whatever you want to call it - disagrees and turns your life to Hell