I see that a lot of people agree with you.
I, however, would gladly permit myself to be scanned on condition that I never had to view the body scans of any of the aforementioned government employees.
That being said, being scanned (and especially having some files stored for unknown length of time) seems to be a very unpleasant prospect for many people. And...
There is going to be a huge outcry when (not if) some TSA employee starts posting some images online - or having a huge stash of them found on their personal computer. Count on it happening.