How does Rudy's view of stealing differ from Liesel's?

In Part Nine, Rudy tells Liesel that she is not a real thief since Ilsa practically lets her in; he says that stealing is "what the army does. Taking your father, and mine." Rudy plans on breaking into one of the wealthier residents' homes. He tells Liesel that the teddy bear is to calm down a kid should he encounter one. Ultimately, Rudy is unable to bring himself to steal. Later, he uses the toolbox to carry possessions for air raids.