The killers are saying Source made a mistake. After all, Source made EVERYONE AND EVERYTHING, directly or indirectly. After all, if something was made by an 'agent of Source', Source is still ultimately responsible. All is part of Source, so. . . Every atom, every neutron, every electron, every quark, charm, and strange.
Yo! And Source made dogs, pigs, and other animals that are considered 'unclean', too. By the way, dogs and pigs are wonderful animals who have SAVED THEIR CARETAKERS' LIVES!!!!!!!!!!
Looking at the planet, I'd say humanity is the uncleanest animal of all.