[fuoqi]

But you have right to protect your home by installing better locks, security systems, hell you can go as far as to transform your rooms into sound proof Faraday cages, which would make task of covert surveillance borderline impossible. Law does not mandate that such systems must include backdoor capabilities.

The law effectively mandates that for every lock there should be a master key owned by police. Even in physical world it works poorly (see the joke under the name of Travel Sentry Approved locks) and in digital world it will be even worse, due to the near zero cost of using such backdoor.