Actually most of the book revealed even Job wasn't totally innocent. (satan leaves the picture after the first chapter) Job did have a flaw like all men yet his sin wasn't the ones his friends was suggesting. Job's sin went along with Proverbs 16:18.Oh the kids were adults? Kill away I say. Who cares about adults? And I see that giving Job's life over to Satan to play with becomes: "stop the special treatment". Job is a judgement against Satan, with an innocent Job being the butt of the joke.
You see people dying as a great evil and I would agree if this is all there is and there is no eternity. This is one of Solomon's points in Ecclesiastes as he viewed life "under the sun."