Describe symbolism in The Caine Mutiny by Herman Wouk

From the text:

"Okay. He hates Stilwell for being handsome, healthy, young, competent and naturally popular and attractive-all the things that Queeg is not. Ever read Billy Budd, by Melville? Read it. That's the whole story. Stilwell is a symbol of all the captain's frustrations, all the things he would like to smash because he can't have them.… Infantilism is very strong in our captain."