As a fellow XBox NA DC player I'm going out on a limb that this question ultimately comes down to frustration with a certain troll using the Curse Eater set to Plague-bomb "allies" on DC. Allies is in quotes because this particular person plays multiple XBoxes and multiple accounts, on EP (main) and DC (Curse Eater troll).
To fix this mechanically, ZOS could just adjust all purging to function like the Purge skill, affecting grouped allies only. Or adjust Plaguebreak burst to only proc on death. I don't know how they let this set go live with such an obvious way for trolls to ruin fights with it.