Call me crazy if you want, but I'm gonna say it.

If kids can experience it, it's okay for kid's cartoons to talk about it. We've had episodes of kid's shows that have talked about homelessness, addiction, mental disabilities, death, guns in school, and child abuse, and we should have more of them without relying on "very special episodes" or one-off characters that cease to exist outside of that episode, also called "uncle aesops". If kids know that something in their lives is not normal, then they can come forward for help.

Even Sesame Street has brought up at least four of those, and that's a show for preschoolers.