I prefer a story as in-depth and as ongoing as this one to have a broad range of moral viewpoints and dilemmas to explore. Emet-Selch is not a 'human', thus he need not adhere to human values and morality in order to have a point or be interesting. It is not any different to how Nidhogg saw things differently by virtue of being the equivalent of an alien. Both needed to be stopped from the perspective of the player character and their allies, though that doesn't mean that they were lacking in justifications according to their own brand of morality.

I absolutely loathe how Emet-Selch manipulated Garlemald and then plunged its already tormented people into chaos, yet that doesn't mean I can't bring myself to sympathise with his own plight. I found him to be quite entertaining.