Warning: this opinion probably won't fit into the HN zeitgeist. If you commit a crime online don't be surprised when they seek to gain evidence against you. This isn't a liberty issue. This is a you're probably a criminal issue and law enforcement is coming after you. I don't protect drug dealers in my neighborhood because of their right to free speech and personal liberty so why would I protect these guys? It just a…
If your local authorities recognize the right to freely speak (and freely receive speech) you cannot commit a crime online.
In the case of buying or selling contraband, the crime occurs when the contraband physically transfers possession. The network is neither necessary nor sufficient to commit the crime.