If the ‘good guys’ have a backdoor then so do the criminals
If the ‘good guys’ can crack your encryption, so can the criminals
Having weak encryption would not have stopped the Paris attacks as the security services had already stopped monitoring them.
If you think “I don’t use encryption” then think again, when you bought something online you used encryption, when you made a mobile phone call encryption was needed to protect the setup of the call, your password is stored (or should be) in an encrypted format to prevent hackers from simply downloading a human readable list and so on. Encryption isn’t some dark evil used only by terrorists, it’s used by all of us for good reasons. The government needs to give better reasons for denying it to the public than “terrorists!!”.
Alternatively maybe they’ll be happy that all their governmental and private communications are no longer encrypted to make the job of the press easier in reporting on their deeds and misdeeds, for surely if they have “nothing to hide they have nothing to fear”