NIEN NIEN NIEN NIEN NIEN NIEN NIEN NIEN 
Nien?
The forget?
Anyway, Riddler wasn't responsible for what happened to the Jews, he never specified what he wanted his generals to do to them, he just told them to get rid of them.
Maybe if Riddler had been just a
bit more specific he wouldn't get so much unwarranted hate