Look at how Google does spell checking: it's not based on dictionaries; it's based on word usage statistics of the entire Internet, which is why Google knows how to correct my name, misspelled, and Microsoft Word doesn't.
It's also why Google knows "Jews should be wiped out" and "Muslims should be exterminated" and "blacks are ruining America" and "whites are neanderthals", all suggestions based on the first two words of each phrase. Yes, I'm provoking Google - but surely people also encounter these by accident.
If Microsoft shipped a version of Office that suggested any of the above as "corrections," they would be lambasted for it, and rightly so. Why does Google get a pass? Is it because our standard of decency is so much lower on the Internet? Or is it because we know that Google is merely reflecting popular sentiment on the Internet, and so the true villain is ourselves?
(In fairness, Bing happily suggests equally monstrous ideas.)