What is the author's style in Idiot's Delight by Robert E. Sherwood?

A polemic is an argument for or against one side of a controversy. Artists are very seldom successful when they engage in polemics in their works, because doing so usually means the work is guided by the lesson that the artist wants to teach rather than by artistic principles.

Idiot's Delight is a work by a pacifist, and it espouses pacifist ideas, but the ideas are not forced into the work. There is enough diversity in the characters for Sherwood to address the issues that he wants to with a sense that they would naturally come up among these characters in this situation.