Friend, you have hit the crux of the matter. The majority of people who want this lady killed are simply cowards who think sacrificing her will stop their fellow zombies destroying everything. They want society to kill her because they don't have the balls to stand up to these mullahs.
They don't have the character to be honest about it either - talking about how guilty she is, knowing full well her guilt or innocence is unimportant to them, they just need her killed to pacify these people they're terrified of.