The way I see it, Megaupload provided a service; a service which some people used to break the law. This was not the sole aim of the service, nor was that its only use. What the law says should be done is that the people who illegally uploaded copyrighted files to the Megaupload service should be tracked down and individually prosecuted for copyright infringement. But they won't do that, because it's too difficult for them. Much easier just to shut down the service, round up the people who ran it and lock them away instead, eh? Except for the tiny problem that it totally changes the way law is enforced, placing the burden on people who facilitate the breaking of laws rather than those who actually break them. Following this lead, I imagine the FBI's next job is to shut down every US gun store and prosecute the owners for every shooting that has taken place with one of the weapons they sold. And the head of every bank for handling any stolen money, or that obtained fraudulently or through tax evasion. After all, they all provided a service which people used to break the law. Hopefully they'll make photocopiers illegal at the same time because they have the ability to duplicate copyrighted material too.
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They won't be doing that? Oh, I guess it's just an exception to the law being made by the US Government because of the considerable lobbying power of the US entertainment industry then.
With the exception of my local bookshop which I like to support, I will be participating in Black March.