Were you around in the 4th invasion?
It was made quite clear that human blood, given freely, would give power to the Light.
It doesn't take more knowledge to extrapolate from that to "NPC peasants are human too! Maybe their blood would work!" Just some creativity.
However, it was far from clear whether it was *desireable* to give power to the light. Many of us, OOC, suspected that they were put them to save our sorry asses, but IC tended to view them as a threat, abominations of uncontrollable power.
I guess that doesn't matter though since those who distrusted the Light didn't actually have any of their temples.
No humans attacked Hetland, but it came pretty damn close. We were scared !@#$less by the bloodbath going on in Creasur and the light's "thou art unworthy" attitude towards us. Hetland was repeatedly told: limit the blood you give them! We'll convince the daimons you leave you alone if you stop powering these beings we know nothing about!