This is a really disgusting story, as many have mentioned, but I can't help but notice that the "Debbie" character is hot as all hell. Even when she's "dying", she's drawn sexily, with the smoky eyes and the way her chest is emphasized in almost every panel she's in. By contrast, "good girl" Betty is pretty but plain, even a little frumpy, and quite sexless.
I'm not sure if that's deliberate, and if it is (which it probably is) what message is it sending? Humans respond to sexy. We like it. We want to be around it, want to be like it. That's natural. Which means either the artist wants us to like Debbie better and is being a little subversive with some under-the-radar subtext ("evil is sexy", anyone?), or her sexiness is supposed to mark her as "evil" and we're supposed to condemn her for it and the message backfires.
Either way, there's no question which character I sympathize with more, and it's all down to how they're drawn.