[somenameforme]

You could easily look at things like the Snowden leaks to see how well such controls end up working out. My favorite was NSA agents collecting and sharing sexual content. [1] The reason that's my favorite is not because it's the most extreme example of abuse - it's not, not by a longshot. The reason is that it really demonstrates that 'government' isn't some abstract or holistic entity. It's just a group of people, like you and I -- with the exact same vices, egos, weaknesses, and so on.

And of course this applies not only to the NSA spooks, but all the way up. You shouldn't be any more comfortable letting 'the government' spy on you, than you would be letting me spy on you. If you want another example along the same lines, spooks spying on their love interests is so common that there's a slang term for it - LOVEINT [2]. Basically, don't grant people power over other people unless it's really just completely and absolutely necessary, because it will be abused. So the benefit needs to substantially outweigh the inevitable abuses. And in this case, that obviously doesn't hold.

[1] - https://www.nytimes.com/2014/07/21/us/politics/edward-snowde...

[2] - https://slate.com/technology/2013/09/loveint-how-nsa-spies-s...