@Pascal Re: Meh.
There was a joke back in the 80's. Before the wall came down.
An Amerikan biz man goes to Russia. (Brings two suitcases. One with some magazines and blue jeans, another with his work clothes. )
He gets to his hotel room.
He talks loudly that this place is crap, the heater isn't working.
5 min later... a man shows up with a work order to fix the heater. ;-)
Again while many may excuse corporate America for spying on us as saying we allow it, that's not quite true. I don't use Google and my Friend's company uses a google vanity domain for their company.
Now Google knows me.
You don't take steps to block some of the invasive tech... Facebook.net on a web site... maybe here. So even if I don't have a FB account, they are capturing data about me. I have to go to NoScript and turn scripts on and off. The point is that you have less control.
The irony is that the Feds have more restrictions on what they can do with the data, how they must treat the data, and how they can join the data... breaking these rules can lead to jail time.
As to why... there really are bad people who want to kill you because you are different than them. I for one enjoy a multi-cultural community where everyone is equal until they prove themselves to be an A hole. ;-)
Sorry, but when you have people blowing themselves up and killing people... I'll accept limited snooping if it means I can sleep safe and bomb free.