It all Begins to make sense now...

...why Katie is Tom's soul mate and not Nicole.

In Batman Forever, Nicole (whose real life mother is a psychologist) played Dr. Chase Meridian, a criminal psychologist bent on psychoanalyzing Batman. Thanks in part to their therapy sessions, her Batman (Tom's wingman) is able to put the crazy Riddler in the asylum where he belongs.

In Batman Begins, Katie (whose real life father is a lawyer) plays Rachel Dawes, a district attorney skeptical of a criminal psychologist's expert testimony and diagnoses. Her Batman has to stop that criminal psychologist from seriously overmedicating the people of Gotham with some psychotropic toxins.

Read into that what you will...