I think this is a fantastic concept with lots of potential! I especially loved the tongue-in-cheek humor -- "Eternal moral vigilance is no laughing matter."
In my opinion, deleting code is fine...however you should 1) be warned that it will happen in the near future if you do nothing about it and 2) it should be tied to some version control system (e.g. GitHub) where it pushes the deletes (maybe even creating a branch and remerging it so the changes are clear) so that code can be recovered if need be.
Vigil can maybe even have some logic built in if you revert deleted code it gets "angrier" and starts more aggressively purging code in the future :P
In my opinion, deleting code is fine...however you should 1) be warned that it will happen in the near future if you do nothing about it and 2) it should be tied to some version control system (e.g. GitHub) where it pushes the deletes (maybe even creating a branch and remerging it so the changes are clear) so that code can be recovered if need be.
Vigil can maybe even have some logic built in if you revert deleted code it gets "angrier" and starts more aggressively purging code in the future :P