The NSA is looking out for terrorist activity. Good luck to them. If my mundane emails go through them, why should I care? It'll only bore them. What have you people got to hide that's so important to world security?
Are you willing to extend this to your physical privacy? Do you mind if a government agent gives you a rectal exam just to ensure you aren't hiding anything just at random? How about if they open up your house/car and go through all of your personal paperwork? Sound fine still?