Inquisitor - Death Sentence

Why does “Death Sentence” lower Piercing, Aether, and Chaos resists, when the class is predominantly elemental damage?

Well, piercing cause obvious reason

Aether and chaos cause of flames of ignaffar transmuter
And also to be useful with other classes
Basically opens more mix

Because there’s already a curse spell that does that and it’s Curse of Fraility.