Why was it banned? I didn't see anything wrong with it.
And I love that guy from Patrick Warburton. He's awesome in everything I've ever seen.
I dunno. I Googled cannibalism and came across the commercial on MySpace TV and it said the commercial was banned. Aside from the humorless old people, another possibility is that the commercial was banned by the candy company because it could be a bit tasteless if the intention is to sell the product.
But really, the Geico caveman commercial is much more offensive to all the cavemen alive today. I used to write scripts for Geico commercials when they still did the "I've got good news" commercials.