Another reason that might contribute to a desire to boycott the olympics is that many of the kids remaining in China (after the sex selection abortions), are being sold into slavery.
There is a slave trade going on in every country, but China is a place which should have become more civilized by now, but hasn't. One thing that interested me about the Reuters story linked above, is that some kids didn't want to leave with the rescuers, because their parents had sold them into slavery.