Superman: Batman believes, that flaws in the Man of Steel dwell in his human side.
Aquaman: Batman relates to the idea that son’s should not lose their Fathers.
The Flash: All families should be protected
Wonder Woman: The perfect woman..
Green Lantern: The Lantern should learn fear!
Captain Marvel: If Billy had parents, would he be the hero he is?
Hawkman: He remembers a time before crime.
Martian Manhunter: Fear of fire..
Atom: Crime is a choice
Zatanna: Limited powers make her invaluable.
Source: Bruce Wayne’s private files in the Batcomputer