Edit: You say "Guardian readers/conspiracy nuts in the comments section, who aren't able to listen to reasoned debate". That's a well-reasoned rebutal right there to the people who replied to you with facts. Could you expand on it? I'm listening.
The idea that this makes one "Guardian readers/conspiracy nuts" is laughable.
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"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
There is a reason that democracies around the world don't allow police to just randomly walk into your house and arrest you. A good reason.
Just because terrorism has to be prevented, doesn't mean that our basic rights have to be violated. By that logic, let's go even further and install CCTV cameras and microphones in everyone's homes. All crimes can be prevented. And perhaps the next step can be to have thought control devices even.
As for the assertions about terrorists moving to other communication methods, that horse already bolted years ago. Osama Bin Laden's reliance on a hand courier made that crystal clear. They've known that their communications were at risk for years now. In that sense, the Snowden leaks revealed nothing new to terrorists.
And if op's were at risk they'd have made arrests immediately or D Noticed the Guardian immediately. As they haven't, it's probably a load of shit.
I would think "we only do it to the extent neccesary" would be what an argument is meant to show, not the argument itself.
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Mass surveillance is not the solution.
Also, their claim that 'they operate fully within the law' is just a claim without any public evidence to back it up, if all three of them were subject to a polygraph during this then I might take it a bit more seriously. Otherwise, why should I be inclined to trust the words of a organisation that clearly does not trust me?