We can all point our fingers at government agencies and blame them, but everyone who downloads movies and music that they haven't paid for and then decide they're not going to pay for it even if they like it are the ones to blame.
Look, I'm not going to defend acts of piracy, but there are already perfectly valid legal channels for going after pirates. Many non-cooperative sites have been shut down through perfectly legitimate legal means. The reason SOPA and PIPA are being put forward isn't because it's the only way to stop piracy, it's because the legitimate ways to stop it involve a certain amount of time and money, and rather than choose their battles and accept that a certain amount of small-scale infringement is going to happen, the content industry wants to be given the keys to the kingdom so that they can shut down infringers at whim (without burden of proof, due process, or chance of appeal.)
It's a power grab, not just a collection of poor oppressed little businesses trying to look out for the defenseless artists they shelter from the bad, cruel pirates.
And while Megaupload may have been under investigation, I refuse to believe that the timing and scale of this ("this" being "a total shutdown of the site and the arrest of half a dozen foreign nationals in foreign countries for a foreign-based business") is not intended to send a message. (As indeed it has, with several significant file-upload sites knuckling under in the days since...)