Force them to intimidate and torture at least one side of every communication they want, instead of letting them intimidate and torture three or four centralized service operators to get everybody's communication.
> The Regulation of Investigatory Powers Act 2000 (RIPA), Part III, activated by ministerial order in October 2007,[20] requires persons to supply decrypted information and/or keys to government representatives with a court order. Failure to disclose carries a maximum penalty of two years in jail. The provision was first used against animal rights activists in November 2007,[21] and at least three people have been prosecuted and convicted for refusing to surrender their encryption keys,[22] one of whom was sentenced to 13 months' imprisonment.
May sound far-fetched, but it isn't.