Let me explain. I'm one of those people who consider both Batman and the Joker (as well as most other people in Gotham City, be they costumed or otherwise), clinically insane. Neither character approaches what most people would consider a healthy mental state of awareness. Bruce Wayne witnesses his parents' murder and what does he do? Instead of using his vast wealth to tackle the roots of crime and corruption in Gotham, and thus do some real, tangible and lasting good, he decides to flip the fuck out, spend thousands of dollars on equipping himself with ridiculous bat-themed gadgets and vehicles, dresses up in glorified riot cop armour or zorro-cum-dracula costumes (depending on who writes him) and spends each and every night beating the shit out of petty thugs or other mentally unstable people. Jack Napier/Jack/Whoever is a petty criminal who ends up dumped in a vat of toxic waste or acid or bleach and what does he do? Instead of searching for medical help or turning himself in, in the hopes of curing his condition, he flips the fuck out, hires thousands of idiotic henchmen, dresses up as a clown and starts murdering people with tacky puns.
Literally the only difference I can see between these two violent, ruthless and deluded characters is their allignment. Batman is crazy, but aligned with the forces of what we tend to consider 'good' (the law, the police, etc.) whereas the Joker is crazy, but aligned with the forces of what we tend to consider 'evil' (crime, murder, etc.) Despite what many hepped-up Nolanites or Frank Miller zombies would like to think, Batman isn't some noble and righteous knight or metaphorical force of law and order, neither is the Joker an 'agent of chaos', or herald of anarchy. They're both just dicks, and deranged ones at that.
Thus we come to this redesign. The idea behind these was to invert the alignments: thus Batman becomes 'The Bat'. Severely unstable orphaned billionaire Bruce Wayne vents his anger and frustration against the world every night by dressing up as the Bat and going down into the streets of Gotham causing chaos, eventually becoming the head of a vicious gang of ex-mobsters and criminals, called the 'Bat-men' and child thieves and drug-trafficers called the 'Robins'.
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Thanks for reading.