Well, luckily we all now have "Felony Machines" installed in all our homes (internet connected computers), that are capable of generating all number of felonies in an evening (child pron and the like). Cliky, clicky everybody.
Between porn, tax evasion (although typically that would be a state crime), and copyright violations, all it takes is a desire by someone in power to ruin your life and you're toast.
I don't see any defense against this -- aside from unplugging -- except to try and cultivate friends in high places, so in case you step on someone's toes you have someone who can step in and get you out. It's unsafe to rely on the justice system to protect you just because you never meant to do anything wrong.