In the cases of some public servants, like police officers, that is not a direct parallel as they are not spending a lot of time in the office. Public servants performing their duty in public should be subject to the scrutiny of the public. Even if you are a government employee working at a desk in a public building you should be subject to the same. I admit it is just not feasible to allow any and all private citizens access to buildings, or to mount cameras as they desire, but there is a perhaps a better solution? Surveillance tapes available upon request?