you summarized it perfectly. to me it was like a great drama. I really didn't see that coming and the turn was so sudden and abrupt.
In fact deep down I enjoyed it for 2 other reasons.
1. at some point everyone has to chose a side. I have. But do we still care about truth and nothing but the truth after we have chosen a side? I respect Ai's pursuit of truth (although I don't always agree with his conclusions). I don't know about Ai. But I think it takes a lot of courage to chose a side but belong nowhere (how you end up if you only care about truth).
2. The other is the balance between my nationalism and my individualism. sometimes I worry my nationalism is just to make me feel better about myself. I don't know if I have a good point here, but I feel instead of trying to properly assign blames for the 5000 lost lives of Chinese young, Ai, an architect, could have spend his energy designing new schools. He obviously love the people. But I feel his choice reflect his individual need to vent anger than an expression of nationalism. I have no doubt that he loves China. but in the end, I thought he made greater contribution when he was building things than being a bitter critic (because criticism is all about asking other people to build things).