Hong Kong's history is irrelevant as they have an extradition treaty with the USA. Any normal person would not seek asylum in a country where this was the case.
And the USA has basically an extradition treaty with every country. They are not always followed, either (granted, I am not an expert on this matter). Of course, they might extradite him, but I don't think it's as clear-cut as you make it out.
http://en.wikipedia.org/wiki/List_of_United_States_extraditi...
It has been widely reported just how bizarre it was to pick a country like Hong Kong given their recent cooperation with the USA.
http://en.wikipedia.org/wiki/Extradition_law_in_the_United_S...
Which one's good? If you really cared about the extradition treaty so much, you'd have a problem going anywhere (given his situation, and I think even for the typical tourist most countries on that list are countries you might not even ever think about visiting. Though I've admittedly visit quite a few of those, so I may be wrong on that point).