While we're cataloging Batman's sins, let's add another one to the list: he's a big fat liar. At the beginning of the Batman: The Animated Series episode "Mudslide," Batman says he's willing to help Clayface get better, but he doesn't mean it. How do we know? Because, as the episode continues, the Dark Knight has a chance to cure the former actor, and instead, he shuts down the life-saving procedure and sends Clayface hurtling toward his apparent demise.
When "Mudslide" begins, the creature formerly known as Matt Hagen has shacked up with Stella Bates, a doctor who's fallen in love with Hagen (more specifically, one of the characters in Hagen's old movies) despite his ever-shifting visage. While Hagen's condition is getting worse—he can barely keep his monstrous Clayface look together, to say nothing of more complicated disguises—Bates thinks she's found a cure. All that Clayface needs to do is get inside Bruce Wayne's biomedical research facility, steal an isotope called Mp40, and…well, that's it.
So that's exactly what Clayface does. Nobody's hurt during the break-in, damage is minimal, and the isotope is the only thing that Clayface steals. The process works, too, and before long, Clayface is on the road to recovery. And yet Batman tracks Clayface down and stops the operation. There's no good reason for this petty act. Bruce Wayne owns the isotope, and it's been tainted anyway, so there's no property to recover. It was a victimless crime, and once again, the procedure is the only way to save Clayface's life. So when the rain mixes with Clayface's deteriorating body and washes him off the side of a cliff, Batman's anguished screams ring pretty hollow. You could've saved him, Bruce, and you chose not to. That's all on you.