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But do all of them? In my personal experience, such tasks will be given to employees who are likely to perform them.

For example, at a past sysadmin job, I was asked about the technical feasibility of monitoring a certain employees computer use, whom management suspected of some minor infringement. I refused to assist in the matter on moral grounds and was reprimanded. The task was given to a colleague of mine who had no qualms about it. Next time, they went straight to him.

And the more complex, distributed and large a system is, the more people are in positions where they can compromise it. It takes only one person to break the whole system (which is basically what just happened to the NSA). Do you trust everyone who has or can gain access to your SSL private key? Everyone who manages your network?