However your analogy assumes that the homeless person (Megaupload) is guilty of theft and lives in the U.S.
If this homeless person lives in another country and someone in America claims that this homeless person stole from them. Does the U.S. government even have the right to go and seize this homeless person's foreign assets?
Everyone seems to be conveniently forgetting that Megaupload has NOTHING to do with the United Stated except for operating on the Internet and not discriminating against U.S. customers.