Because clearly our entire legal framework should be designed around making the NSA's job easier. Why not put surveillance cameras in everyone's houses? Why not implant everyone with tracking chips? Why not have TSA agents look up our assholes with a flashlight at airport security? All these things would certainly make the country safer.
Just as concerning as the programs themselves are these kinds of idiotic arguments that their proponents make to justify them. I'm not hugely keen on trusting someone who can't avoid extremely simplistic logical fallacies in his reasoning to oversee the surveillance of all humanity.