The finders aren’t aliens or demons, exactly. They’re creatures made by the Puppeteers and call themselves “The Puppeteers’ Children”.
They believe that they are higher beings than all except their creators and it has been ingrained into their minds as a species that they are near untouchable, and that power is meant to be exerted.
At one point in the past, ancient humans managed to kill many of the Finders and seal the remaining fifty into the moon through special rituals.