Dark Urge doesn't care about the biggest mass kill possible?

I mean, the option to kill Cazador's spawns? They are all sentient being who can have free will, as Astarion's questline teaches us. We get rewards for genocide mass murder at Last Light Inn (as long as we caused it), or killing some chicks (Isobel, Alfira/Quill), but one-shoting literaly 7 THOUSANDS of spawns doesn't even get a special comment from narrator? I doubt the entire game has so many NPCs, so even ultimate murderhobo run can't achieve that kill count.

Edit: considering the option where it's Durge who uses the staff to kill them.