When it comes to computer security I have been most concerned about the US or Israel spying on companies for commercial secrets. More recently I've added China. About ten years ago it was indicated to me that NSA routes all hotmail out of the country, scans the email, and then routes it back into the US. It wasn't said, it was indicated, by a high level NSA manager.
This using government and military power for the benefit of business friends is not new. I recall how surprised I was to find in a company repository all kinds of technical documents lifted from foreign companies detailing their processes or underlying scientific theories. The source of the documents - the US government. That experience was about 35 years ago!
In my company, to protect our investment in advanced technology, none of our computers with technical content are connected to the web. No technical documents are transferred by any form of direct link to another computer. Employees are given two computers, one for internal work and another for connecting with the world. No one is allowed to travel with computers having technical content (we spend a lot of time in Israel, China, Korea, Japan and naturally the US (stone age in this technology). And for phone communications we have a rich vocabulary of code words so that we do not discuss matters in the clear.
The Snowden disclosure was not a surprise to me but the extent of non-essential spying on people is disgusting. Even the code names for their spying programs reveals a juvenile mentality- these are immature jerks not serious defenders of their country.
I understand the need to gather communications from our sworn enemies and I don't mind some excursions into my privacy to assure completeness.