Why the Jewish character must be the bad guy?

I wonder why? Why not the Chinese, the Indian or the Indonesian, just to give some random examples...True is that in every community there are bad guys and good guys and Jews are no exception to that but, besides this reality, the literature creates or emulates certain models and stereotypes which perpetuate certain negative stereotypes, including those with anti-Semitic flavours. 

My recent experience in this respect is the short story part of the Santa Rita Stories, by Andrew J. Rodriquez. It collects various stories based in Santa Rita, a little fishing village in Northeastern part of Cuba. Created as an initition story into life of the little Carlos by the destitute Pedro, it includes various lessons in understanding life and humans. One of them is dedicated to Carlos encounters with the family of Veronica, a girl he worshipped in secret. Everything started with the invitation to attend and accompany her to her fiesta de los quince - celebration of 15-year anniversary, an important moment in the life of a Cuban girl. 

Both Pedro and his parents are warning him that she is Jewish and thus, different traditions apply. But when he received an invitation to meet her father Benny, he has a little nightmare experience. The house is guarted by a huge dog who is ready to bit everyone that is shaking hands with any member of the family. The interior is full of kitsch expensive looking art, besides Jewish symbols. The father, Benny is not only 40 minutes late and impolite, but offers him a dirty deal: to pay him to keep his daughter away from the previous boyfriend till the famous party, which is planned as a way to invite famous local people and climb up the social ladder. He is open with his intentions: 'The pride and joy of elevating our status far beyond the common folk is all I care for'. 

Brave Carlos will not succumb the temptation and will reject the invitation to the party, while keeping a secret relationship with Veronica till her departure to Havana to her aunt for law studies. 

Again, you don't have to tag ethnicity for creating bad guy characters.