Then it seems that you and I are not reading the same Bible. God's Word gives Satan just as much responsibility for the evil conditions that exist in this world as he does man.
Romans 5:12-14
12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
13 (For until the law sin was in the world: but sin is not imputed when there is no law.
14 Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come.
Heb. 2:14
14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
15 And deliver them who through fear of death were all their lifetime subject to bondage.
Furthermore, the Bible is very clear that unsaved men are under Satan's sway and control. I gave you a few references but there are much more, such as the following:
1 John 5:19 (NKJV)
19 We know that we are of God, and the whole world lies under the sway of the wicked one.
Hence, if Young's theodicy totally excludes the devil from the equation then it is an incomplete understanding of the problem of evil. There has to be more behind Hitler's slaughter of six million Jews, the intense persecution and martyring of Christians around the world in Muslim and communist countries, and even the evil behind the militant gay and abortion agendas than just simply men and women making choices for evil.
When you read Revelation 20 and see that there is no lasting peace on earth until Satan is bound for 1000 years and then rebellion only starts again after he is released, then there is something more to evil than just man's choice alone.