Impossible to implement without compromise to security

If a company implements a back door into their encrypted service, it renders it effectively useless for ALL users, whether they're under suspicion or not. Anyone with the decryption key can access the system, so it's open to abuse by the company, government or hackers. It all well and good saying "only with a warrant", but this is missing the fundamental point of this issue. It's impossible to build a back door into an end-to-end encrypted service without compromising the privacy of every user.