I can't make enough sense out of this comment to fully reply to it. The DoJ obtained enough probable cause evidence to support discovery of Mega's emails. The emails showed the owners and operators of the company conspiring, in black and white plaintext email, to further the use of MegaUpload as a vehicle for making money via piracy. The DoJ initiated a prosecution, which is now working its way through the court.

If you don't believe commercial piracy on an industrial scale should be criminalized, then naturally you'd believe that there aren't enough due process constraints on the DoJ to pursue those cases. But if you accept the fact that creating hugely profitable high-volume piracy applications is a crime under US law, it's hard to see the "due process" problem here.