Re: Here we go again...
The key to stopping this is to turn around the argument "if you've done nothing wrong, then you have nothing to fear.". If law enforcement and spies want to set up surveillance of public places, let them, but only if that surveillance is made available to the public who pay for it (and I mean just as available as it is to LE and spies). If LE and spies wants to spend taxpayer's money to backdoor encryption by being added to the conversation, then the general public should be able to backdoor encryption and be added to the LE and spies' conversations.
Of course, they're going to whinge and claim they should be held to a different standard. When they do, ask them to prove it and don't accept "because terrorism", "because national security", "because official secrets", ore even "think of the children" without making them produce evidence. In reality, the majority of classification, secrets, emails, and conversations are not, in fact, about such things.