Top Gear is the BBC's single most lucrative programme, apparently (they sell it to countless countries for vast sums), so the presenters appear to be untouchable.
No one should be shocked, this is typical Clarkson. And I think, once you add up all the similar unpleasant jokes made over the years, you'd have to say, he means it. He isn't just jabbing at political correctness, being outrageous, robust, old-fashioned, championing freedom of speech. He's doing a bit of all those things, and he also means it. East Asians are slopes, black Africans are niggers, women are useless.
And the disingenuous apology adds insult to injury. It is so lacking in credibility as to be contemptuous. The reason we can all hear him saying the word nigger in the footage is...because he said the word nigger in the footage. If that were genuine accident, we'd also have heard him say 'Oh Christ, sorry, didn't mean to say that, scrub it. Let's start again.' Or something. But we don't.
That's assuming anyone can genuinely get into the position of saying a word they find grossly offensive 'by accident'. Don't know about you lot, but I've never called anyone 'kike' or 'white trash' or 'Paki' or 'retard' or 'Taliban murderer' by accident. Or indeed on purpose.