You are naive if you think that national security is the reason for all this surveillance. It's a pretext, a convenient excuse for the masses. The real reason is establishing a global surveillance network, monitoring digital communications both in the US and abroad and establishing/continuing international supremacy.

Since you can't explain it in those exact terms to the masses without causing an outrage, you have to tell them it's for their own safety and to protect them from brown skinned tunic-wearing AK47-waving freedom-hating lunatics.