Considering the Kenoma's aim is to destroy the world, Dokja thinks letting all these townsfolk die would suit that goal just fine. He doesn't know if he believes Emet-Selch, but if that's the stance that the other man wants to take, then...

"Who says we share the same goal?" Dokja asks, his tone dismissive and disinterested. "Since you and the other Kenoma are here, I wonder if you're acting under the Regent's orders? In that case, maybe I'm supposed to hinder your aid of these people."