[Leia was looking for a cut and dry response, when there really wasn't one.]

We all have those feelings to some extent. Anakin was certainly not born evil, no more than anyone else.

[While it might be stalling a bit, and its not entirely what she wants to hear. Obi-Wan felt the point needed to be made just the same.]

I can't say there weren't signs. There were. And I didn't act on them as I should have. But if you're looking for a reason or person to blame for the creation of Darth Vader, there isn't just one.