Just like how you are the traffic, you are also the mob
Mobs are not formal organisations with leadership and membership dues.
Mobs are general everyday people who are sick and tird of this miserable life and need an excuse to rabble and rouse.
So in this case, fake dead person's blasphemy will only be channeled towards their family members, mobs just need an excuse to get crazy.
AI is not what causes mobs, it just helps lower the incitement barrier by providing quality bait.