would not be the first time peoples fall for 'devilish' temptations, the jews were once merely a subsemitic tribe afterall, in dire times they made a 'pact with the devil' and would hence forth lie and deceive just in order to survive, they were at risk of being racially dissolved in other nations and tribes, to preserve their unique characteristics they chose the 'bad option' such as rather procreating with family members etc. with all its negative side effects.
Germany