Jeezus, how do you fix a broken Human Being? Moreover, should you even try? Experience tells me No, any interference in another person's life is more trouble for the both of you than it's worth. As with all things, no one has a lock on the truth, but there are some times when it's quite obvious that the psyche is not functioning in a healthy manner. I want there to be a good way to help someone else help themselves without sounding like I'm trying to change them or dispensing wisdom from a vending machine. I will give what I can when asked, I will not judge, and I will continue to do the one thing I've always been good at, setting an example.
In the end, I suppose, you have to want to change yourself.