Thief
Rogue Theologian
Of course it was. You claimed whether dolphins can be considered evil depends on moral agency. However, moral agency is a flimsy term that ultimately doesn't help the matter.
Knowing right and wrong is typically used to assign culpability, but there is nothing intrinsic to moral agency that would make this deductive. It also doesn't help with determining who or what is considered evil, since right and wrong do not carry the weight evil does.
Shall we bite that apple?