Is there any way for there to be a rule stating that it is traitorous to not shoot someone who is a confirmed traitor?
Yes, I am working on the wording.
III. General Traitorous Actions (Killable):
18: Not shooting at or around an unquestionably confirmed traitor. [does not permit teamkilling if you are a traitor yourself.]
OR
III. General Traitorous Actions (Killable):
18: Not shooting at other traitors, Go on, you might also be a traitor... but think about it, nobody'd suspect you, go on, go for it...