Werewolves were originally bandits
who could be killed with impunity.
David the Werewolf is likely a Jewel.
Jewels were killed with impunity
under the Nasty regime once stripped
of their citizenship, such that
they had to invent 'the crime
against humanity' to successfully
prosecute the architects of
the Final Solution.
There is a scene
in the film where
David dreams that
Nasty monsters have
come to kill him
(there is a menorah
in the background).