I would love to have a unified theory of how to understand timtum.
Simply stated: you are what you eat. Eat non-kosher and the body God gave you in order to live a holy life becomes a depository of impurity. Fast, and you are doing the equivlent of sacrificing some of your body in atonement.
Bottom line: silly nonsense being fed to ignorant simpletons who live their magical lives ignoring the obvious. Namely, that their rabbis are profit motivated, power hungry incompetents who couldn't do the simple job of night watchman without screwing up.
People, it's time to take back your self determination and expel the do nothing rabbis. Even the least capable of us would not have allowed Perdue into the freezer or Kolko into the classrooms.