Is Joker really the Dark Knight that Gotham deserves?

There's something familiar about this style of logic... or have I been reading too much political press lately?

According to this theory, all the Joker's "chaos" in "The Dark Knight" was just a well-executed plan to rid the city of criminals and corruption, which it kind of did. Because of this, Gotham's real hero is that crazy clown guy and not the dude with the cool black motorcycle.