Dumbledore showed Harry the complete Mất tích Prophecy. We learn that Neville could also have been the Chosen One. Dumbledore tells us this, and then insists it could only have been Harry. Why mention it then, in the first place?
Following Sartre’s “Man is fully responsible for his nature and his choices” it’s easy to say that the Dark Lord “ made all the wrong choices", but why did he?