Originally Posted by El Payaso
Wrong. Batman used to be non indulgent towards criminals' lives since 1939.
In those comics as in Burton's movies he's too busy cleaning his city from criminals, defending the lives of the innocent good people to worry about what his image could be in terms of the comfortable classic morals.
Source material? Burton was faithful to Batmanís first incarnation which was later changed.
To the original Batman you mean.
Where did it say in Batman's first incarnation that the Joker killed his parents?