People use forks to become obese. Ban forks.
People use cars to rob banks. Ban cars.
People use bittorrent to steal music. Ban bittorrent.
Criminals will ALWAYS use lawful means to unlawful ends. Banning the lawful means does not prevent it.
What prevents it is actually holding criminals responsible for their crimes, and making prison HARD, as opposed to the modern "friendly" prisons that are more like club resorts.
If all crimes were punished with hard labor, people would stop committing crimes awfully fast. No TV. No free education. No magazines. No books. No gym. Just a sledgehammer and a pile of rocks. All day. Every day.