The Supreme Court came down on the side of consumers when this discussion first came about when VHS players first came out.
The "Fair Use" principle that has become the backbone of a lot of open licenses like Creative Commons, etc.
We consumers have a legal right to keep a backup of stuff we buy.
Unfortunately, in this era of broadband, peer-to-peer, and cavernous hard drives, its soooooooooo much easier to abuse these tools.
Drawing an analogy with guns - guns do not kill people, people kill people.
But then again, the current tools available for cracking is like the gun equivalent of a Doom BFG (Big F**ing Gun)!!!!