Easily missed as this is part of the extra rulings listed on the forums, but it’s actually not the correct answer, see the following thread:
Exact quote:
Rare or unique items such as the Wardens krav maga gloves, compact combat shotgun, or traitor objectives, are always self antagonising when stolen from someone or for no reason, unless there is an immediate purpose or need to steal said item. If the player cannot provide a valid reason, it is self antagonising behaviour.