But we're not talking about a bank robbery here and we're not talking about a sack of dye-stained bills that was found on the passenger seat of the getaway car.
Megaupload is a business and data storage and file hosting services are not inherently illegal. Clearly, Megaupload has some baseline amount of business that is not the subject of the complaint. However substantial the infringement and related charges may be, it's entirely possible that a large amount of Megaupload's business is completely legitimate. But this a question for the court and there's no purpose to be served by the destruction of evidence en masse.
To find that all of Megaupload and Schmitz's assets are forfeit as proceeds of criminal activity is to foreclose any possibility that the defendants might be found innocent.
To seize the entirety of a business's assets on the basis that some as-yet-undetermined portion of their revenue is alleged to be infringing is not only disproportionate, it is a violation of due process.
Where does this end? If a collection of infringing files is found to be hosted on Amazon's servers somewhere does that allow the government to seize all of Amazon's assets, cherry-pick the evidence and destroy the rest, to the point that Amazon are unable to mount an effective defense?