Who do you consider to be an idealist in the play?

Chris is described by other characters as an idealist, although we do not see this trait in action aside from his angry response to the wartime profiteering. Yet the others define him by his idealism, setting him apart as a man of scruples. Chris decides that he must abandon these scruples to the cause of practicality when he is faced with the prospect of sending his father to jail. Is idealism sustainable in a fallen, complex world? If ideals must be sacrificed, is there any supervening ideal or principle to help us decide which ideals should be sacrificed in which circumstances?