Probably for the same reason that Amphibia can get away with death, killing, torture, and murder of so much of its cast:
Not human.
Somebody told Matt Braly, the creator and showrunner of Amphibia, that you are literally allowed to do whatever you want to non-human characters and Standards & Practices will let it slide, because if the things are happening to non-humans they don't consider it a matter of concern to underage viewers.
And all those aliens in TCW... they're not technically human, are they?
