Well, as for the Ren and Stimpy scene, characters shoot others in cartoons. The point is it's all done for comedy, and it's usually talking animals. And instead of talking about it, they actually do it (I mean, hasn't SpongeBob torn his limbs off many times?)
The Sym-Bionic Titan episode... well, it's not uncommon to see "sexy" scenes like that, and I've seen characters in children's cartoons wear less (the beach episode of Avatar: The Last Airbender comes to mind). There's also Winx Club, but I've talked about my mom's attempt to ban it enough.
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