Remember that Google's mission is to "organize the world's information and make it uniformly accessible and useful". Their purpose is not to block the content at all - if it were up to only Google, they wouldn't have either a block or a redirection, you'd just be able to access the content. The country redirects are the result of a negotiation with the country, where Google says "Okay, if we did this, would it be acceptable" and the government says "No, too permissive" and then Google says "Okay, what if we did this?" and then finally the government says "Alright."