I think it's more about vengeance. If it were not for vengeance, it seems healthier to just quietly move on and completely forget about the thing they hate. B

I think it's more about vengeance. If it were not for vengeance, it seems healthier to just quietly move on and completely forget about the thing they hate. By deleting data and being vocal it, they are hoping to find like minded users to amplify damage. Maybe it's schadenfreude.