Batman takes the blame because if anyone found out about what Harvey did, all the people he put in prison and jail would be freed based the legal justice system. Simply put, Batman has to take the blame else everything would be undone... the streets would be running with criminals just like the Joker, chaos and mehham. To stop that from happening, Batman is thus a fugitive and must run from the cops because he did take the blame. Batman also must continue to free the streets from people out there still like the Riddler and the Penguin... Mr. Freeze... Poison Ivy... Catwoman he must protect the town from these until Batman is no longer needed... or until Bruce no longer needs Batman. Everything they worked for must survive and last so that Gotham is criminaless... which is impossible.
IMDb, Wikipedia, ect... including common sense which seems not so common...
· 1 decade ago