Bruce Wayne worked in the SWAT team in Gotham City. Under a control of a corrupted government led by Harvey Dent/Twoface, Bruce's family got killed. Bruce's partner, ***** (the Joker), went to therapy after witnessing/committing something horrid and went insane and became the Joker.
Bruce decided to quit SWAT, retained his uniform and then became the Batman in this universal.
He became the Robin Hood of Gotham City.
Inspired by [link]
and my own ideas for a realistic Batman.