I was an engineer on Google's web search indexing system for 4 years (including the Aurora attack), leaving shortly before Google's China exit. I listened to several talks by the head of Google China, who came from Baidu.
Even before the Aurora attack, as a matter of national pride, we knew the very best Google could hope for was 30% or 40% market share in China. Even France funded one or two attempts at a Francophone Google killer. I can't imagine the U.S. looking at a dominant search company based out of anywhere except North America (or perhaps the Anglophone Five Eyes) and not butting up significant nationalistic barriers.
Google was hoping to make profits, but they knew they would never be dominant. This made their exit much easier.
If Google was serious about China, they would have had a more obscure non-Google-branded name for their Chinese joint venture and would have branded their front page much differently. The reasons would take a large post, but Chinese web pages tend to be much more "busy", and Chinese language searches have a much higher percentage of "navigational searches". (If you search for [Facebook], you're almost certainly just trying to just get a link to facebook.com, and are basically using the search engine like a bookmark page.) I understand Google's need for a consistent U.I., but they really should have had a non-Google-branded U.I. that was better suited to the Chinese market.
Apple is not aspirational in China today: they are already making a lot of money there. Leaving China would cause an immediate shock to its stock price as well as a huge cut in actual profits.