Because in the leaked justice league part two story board that circulated around the Internet last week, Lois Lane and Bruce Wayne were having an affair while superman was dead, and she’s pregnant with his baby, and then like superman came back and raise the kid, and then like Lois died and the kid died and then superman went fucking nuts and that’s why you’re living in that terrible fanfiction with batman and the Joker on the bridge. Which only exists because, apparently Zack Snyder was like I can’t leave the DCEU without having Batman and Joker interact, so I’m just gonna come up with the bullshit reason for them to interact in my movie.
🤷♀️🤷♀️🤷♀️🤷♀️🤷♀️🤷♀️🤷♀️🤷♀️