T-Rex: One day Batman was looking out for crime on a rooftop in Gotham City while also brooding when he realized, "wait a second, my enemies each reflect some element of myself!"

T-Rex: "For example," he brooded dramatically, "Two-Face reflects my OWN dual identity!"

T-Rex: "And Joker's chaos is an inverse reflection of your desire for control," Robin added. Batman nodded. "Catwoman," Batman said, "enjoys the thrill of dressing up and breaking the law; Scarecrow seeks to terrify his enemies; Mr. Freeze claims to be dead to all emotions, which gives him focus. All such descriptions could be seen as aspects of myself."
T-Rex: "I'm surprised I didn't deduce this sooner", Batman added.

T-Rex: "My enemies are great for drama but suboptimal for me to stop crime with," Batman realized.
Utahraptor: So what'd he do?

T-Rex: Oh, he swapped enemies with Superman. Supes was able to round up Batman's enemies quickly, and Batman made quick work of all Superman's enemies too. They'd prepared for a strong alien vulnerable to Kryptonite and not a smart human who didn't care about tiny green rocks. Crime was over, the end!

T-Rex: I call my tale, "Poison Ivy Reflects Batman's Desire To Garden A Little More And Also Mind-Control People So They Kiss Him, And He Is A Little Scared Of How That Makes Him Feel".