Can you help me understand the setting better?

Right, but isn’t the necessity of mortal suffering one of the chief tenants of the Dark Triumvirate? That’s the impression I got from Codex Arcanis, at least.
Yes.

All the gods have “good parts” and “bad parts.” What really sets the Dark Triumverate apart is their belief that the world is evil and only through suffering and wallowing in evil acts that the soul sickens of the world and can escape reincarnation to dwell amongst the Gods. That philosophy could (in theory) have taken root in any of the different temples … but the DT is in Canceri which is mostly home to The val’Mordane, val’Mehen & val’Virdan (so you get Neroth, Sarish, Nier). It’s also a major factor that Canceri has been a dumping ground for malcontents so by the time of Bercherek the three temples there are also oppressed outlawed and/or disfavored.

By contrast modern Ansharans are respected in the MC & MOC if not exactly politically powerful. The Ansharans want to alleviate suffering, or help the suffering shoulder thier burdens, or even inflict suffering on the wicked. They aren’t really the same thing as someone who thinks the world is evil and you need to make others suffer for your souls salvation.