Why do you think Juliek would play music in this terrible situation?

After being denied his life, humanity, and future by the Nazis and after having becoming emotionally numb from his time in the concentration camp, Juliek takes everything that has been denied him and infuses it into his music: "He was playing his life. The whole of his life was gliding on the strings‹his lost hopes, his charred past, his extinguished future. He played as he would never play again."