All people turn out just as God has made them unless you don't believe that God has made us so. This is the path to Open Theism-the belief that God doesn't know the choices of men.
If it is none of our doing, if it it is not because of our digression against God's will, than Christ's sacrifice is not done for our fall but for His own sake and glory.
Man was certainly culpable but it was preordained by God the Father.
Then how can man be faulted? The only way man can be held accountable is if, at some point, man resists or wilfully disobes God's will, and takes the fall for it. Otherwise, it's none of his doing.