Thank you very much for the points you stated in this post. One is abuse of power and privilege. The people working in the security bands of government institutions are all humans so it would be unrealistic to think that they will be always moral, especially when they know that their access to more power is dependent on them following orders that lean towards abuse of their power.

The other case is the fact that every government can protect its citizens without needing unfettered access to their daily lives. Knowing this, it would be unwise to give up ones privacy for security.