Sane or Insane?

It is a topic of great debate among literary critics but in my opinion Billy Pilgrim went insane due to his involvement in the war. Since this is an anti-war book, Vonnegut would want to show some of the negative effects war has on its soldiers. The major reason I think that it is all in his head is that the books that Billy was reading by Kilgore Trout had the same storylines of the events that Billy was supposedly taking part in. THe majority of his family also believed him to be insane because he lost so much in the war and his wife once he got home. Vonegut uses the characters insanity to show war's effect on the mind.