Antonin wouldn't appreciate the knowledge that he had no desire to be the Dark Lord to get out. It was the assumption that he was simply biding his time until he chose to take power that kept so much of their society on edge and fearful of him. If it became public knowledge that he was just looking for any excuse to not lead the remnants of the regime, they could be in serious trouble. Once he was no longer considered a serious threat, their enemies might believe that he could be easily dispatched of. As complicated and confusing as her feelings were for her husband, she didn't want him dead.