Each god is beholden to their nature and portfolio. Some say that a mortal's very existence is transformed upon attaining godhood, and some say that only those who embody the divine persona can attain godhood, not the other way around.
Eris is a demi-goddess of murder, and she must embrace murder if she wants to attain that form of godhood. The same is true with Mira, who must bear the fangs of greed to ascend.
Kali isn't an exception. She is the goddess of demons and was born a demon. She was destined to become the goddess of orphans and thus ended up having both of her parents killed, turning her into an orphan. Her portfolio of destruction wasn't all that simple as well. Even if she mostly keeps low, her power, her angels, and demons are sowing destruction on both the abomination war and the blood war fronts.
She must adhere to her very nature of a demon, of an orphan, and that of a destroyer.
