You can say whatever you want and criticize the United States, but this is the Only country in the world that have such a policy against worldwide Cyber Crime and actually DO something!
It may be uncomfortable to US citizens, but the government is sure doing what it suppose to do, and going all over the world to accomplish its goals.
Liberty Reserve, as easy as it was to use for 7 years, was a well-built laundering machine. Not everyone used it to criminal \ 'grey' activity, but sure a whole lot did.
This may be the case with Liberty Reserve. I have not followed the case, so the fact that I haven't seen any particularly compelling evidence the government claims about it are true doesn't mean much.
However, the Megaupload case strikes me as a classic case of government overreach, the raid on Kim Dotcom was pure jackboot lunacy (and later thrown out by a New Zealand court as illegal), and so far, the U.S. has woefully failed to make any solid case against Megaupload itself (as compared to its customers). It appears to me that either what Megaupload was doing is legal, or else what a lot of other more well-established corporations (including Google/YouTube) are doing is just as much a crime.
It appears to me they went after Kim Dotcom more because of his larger than life persona (see what I did there) and appearance of being a buffoonish egomaniac than because he actually broke the law. If he is a lawbreaker, then apparently lawbreaker is just another name for a successful entrepreneur without a big corporate backer.