Yep yep yep - don't want to sound like your cheerleader but I 100% agree with what you are saying.
Hanna strikes me as the kind of person who KNEW what she was getting herself into, but somehow it appears to me to Schlink changed his mind half way through, trying to "fish" for a reason why she did what she did.
Let's face it - in all aspects of life we will come across people who will do something "just because". They do not worry about the why's and what's, they just get on with it and some "grow" a conscience because they feel it is the "right" thing to do.
I am sorry but if you work in a Concentration Camp you KNOW what is going on. Maybe, just maybe Hanna (or rather Schlink) tried to convince herself that she was not all bad by "choosing" the Reader's to make their last months more bearable...
Anyhow, I ramble - To tell you the truth, I enjoy the discussions about the book more than the book itself