I hope I don't offend our ethnically diverse readers out here but I can tell you the absolute and complete cause of all this b.s. To put it bluntly, everybody in the US can say whatever the hell they want, as long as they aren't white.
See if a team of black writers make a movie today that involves blackface, it's considered to be social commentary or something hi-art. On the other hand if a white team of writers were to write the exact same script, it would be considered offensive and never get to air. Because of this horrible double-standard, networks and media companys are frightened to say anything even remotely offensive towards anyone (except rednecks, nobody seems to be offended bashing the poor old redneck) unless the cast is prodominately ethnic or the writing staff is.
To give you an example, several of the looney toons cartoons that involve goofy "hill billies" are still aired today on televison, which is a horribly racist (yet hilarious) portrayal of people from my reigon. Or at least judging from what our ethnically diverse friends consider to be racist it is, personally I just find it to be funny. On the other hand, any stereotypical protrayals of black or asian people in the shorts have been removed. In all three cases they are over-dramatized stereo types of the races they represent but only the white guy is allowed in. I can only conclude that it's ok to make fun of white people but nobody else.
Now see I'm all against racisim so if anything in any of these cartoons were truely racist then I would be the first to say to ditch em, but they really aren't. Cartoons exaggerate, so of course when they show an asain guy he's gonna have thick glasses (and probably a camera), when they show a black guy, he's gonna have big lips and talk like a guy from the south, when you show a guy from the mountains he's gonna have a long beard and a few teeth missing. See that's the FUNNY part. It's not offensive unless you have a stick up your butt. I mean have you guys seen Elmer Fudd? Do you think all white hunters actually look that goofy? (ok don't answer that

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We aren't talking about racist cartoons of the 20's and 30's where all black people chucked spears and all asians tip-toed around in those pointed hats, these are just characterizations of certain types of people.
I've never been more offended in my life when they replaced the voice of the black maid in tom and jerry. I know women who look and talk EXACTLY like her. So if I were to characterize these women in some sort of short or film I would be considered racist? That's just a steaming load.
I don't even want to comment on the violence censoring. Somebody outta explain that violence is the basis of all warner bros. animated humor. I mean literally, the shorts revolve around characters hurting each other... hilarious.