mcfilms--
No one likes the fact that doors sometimes have to be locked to keep people out. But by the same token, it's sometimes wiser to lock a door rather than follow the practice of leaving it unlocked and counting on the law providing a remedy after someone comes in and takes something.
Oddly, based on the snippet of law buddhapi posted, it reads as if locking the door may be required to make the intrusion a violation of DMCA.
If we are going to use metaphors, I'd also say my example may be "locking the doors and barring the windows". The useragent blocks would be locking the door. The IP blocks might be "barring the windows". Of course, the next step is figuring out how to install the security cameras to record who tried to get in the window.