Wouldn't "McCarthURism" be Google swearing that it would return to China ^_^?<p>The CIA mnemonic MICE on the reasons people turn is useful here:<p><pre><code>  Money
  Ideology
  Compromise
  Ego
</code></pre>
The PRC government doesn't require ideology (I suppose it would be nationalism more than anything else, especially for motivating the people) when they can use compromise, perhaps sweetened by a little money.  Ego probably comes into play as well, when you're a "little guy" breaking into a world leader like Google.