For a dishonest student, if he/she did not get good score, he/she will usually blame the teacher rather than finding out his/her own problem.
It seems that Google.cn has been a loser in the market in China as only a negligible amount of people use google.cn (google has 32.8% market share in China among which only 0.33% is from google.cn and the rest from google.com according to information on web). So it seems obviously, google sees no hope for google.cn to win the Chinese market. This is market competition: there are winners and losers. It seems that Google does not want to accept their failure of google.cn, and that is perhaps why it blamed the government. Another possible reason is to use it as a strategy to get commercial benifit by playing politics.