Israeli singer Amir Benayoun released a song Sunday about a theoretical Arab Israeli youth stabbing Jews, garnering accusations of racism as Israel copes with a wave of attacks by East Jerusalem residents. “It’s true that I am just ungrateful scum,” Benayoun sings in “Ahmed loves Israel.” “It’s true, but I am not guilty, I wasn’t brought up on love. It’s true that the moment will come when you will turn your back on me, and I’ll stab you right in the back.” In the song, one version of “Ahmed” lives in Jerusalem, studies at the Hebrew University, and is well-liked....