How did Hitler turn out the way he did?

As I navigated various sites searching around for Hitler's biography, it came to me how vastly they different on some points, but how they also agreed on others. All the sites basically talked about how Hitler, when he was a student, and later, when he was homeless in Vienna, formed his ideas about how Jews should be treated, and how to solve Germany's economic woes. However, how he came up with these ideas, two very different sites caught my eye. One site said that he was taught by an important political figure. Another claimed that while staying in Jewish-funded homeless shelters, his bitterness against them formed. Where these sites differed even more, though, was on Hitler's childhood. The first site said that he suffered through a miserable childhood, and was of a "moody, lazy, and unstable temperament." The other one, though, talks about how Hitler was a talented and motivated child who yearned to join a peaceful monastery as an adult. The fact that these sites vary so much on the issue of Hitler's youth intrigues me; it seems that the best way to figure out his mentality - and how to prevent it from re-surfacing in our youth - would be to find out what caused it, and no one clearly really knows what did. I think that it would benefit our world to a great extent to have the key to Hitlers' mind through his childhood, and I am surprised that more research has not been done into the topic.