Earlier quoted context omitted.
What are these benefits?
I believe it helps ensure security. I don't believe they'd bother doing it if it didn't. I think you're a bit arrogant for assuming they give a fuck what you write to your girlfriend on iMessages. I know you probably disagree with that, but this is my point - not everyone agrees that surveillance is bad. And I'm not alone - I think most people don't really care about surveillance. And this isn't a conspiracy - it's j…
This is absolutely not why people object to pervasive surveillance. The democracy that you harp on about above as the justification for your position is fundamentally incompatible with pervasive surveillance and secret trials.
The problem is not whether they can see pictures of my cats on twitter or imessages to my girlfriend, it's that with pervasive and universal surveillance of our communications which GCHQ is engaged in (collect it all, mastering the internet), those in power would become almost omniscient and able to manipulate our markets, our economy, our politicians, our judges and every other branch of our society. This activity is currently not significantly limited by law, but only by technical ability, which is fast changing. For example all SMS messages in the UK are stored, and all internet traffic crossing the kingdom (which is almost all of it) for as long as possible (Tempora), probably some phone calls too. We also don't even know who they share it with - probably the NSA given their subsidiary relationship. In the wrong hands, this would be a terrible weapon, and even in the right hands, it's likely to pervert those given the power.
If you had access to the private emails of judges, lawyers, accountants, politicians, in retrospect and forever it would be incredibly easy to make and break careers and manipulate everyone else in the country to bend them to your will. Now imagine this power in the hands of a select few, and the rise to power of someone ruthless enough to use it for their own ends. Perhaps initially they'd simply nudge a referendum on independence, or a presidential election by releasing inconvenient emails at the right moment, maybe they'd ensure their continued funding with blackmail (has this already happened, would we ever know?), maybe they'll decide they could run this place better after all - again, we wouldn't even know our democracy had been entirely subverted until it was too late.
IMO the time to oppose this sort of surveillance is now - surveillance should be one-off and controlled by independent judges on a case by case basis, not pervasive and eternal.