From The Economist:
To eschew such tools is to fight terrorism with one hand tied behind your back. But that—with one hand tied behind their back—is precisely how democracies ought to fight terrorism.
Exactly so. But we’ve spent many decades getting used to the idea that there really are no limits on what government can do. The General Welfare clause tells us that anything goes, they say, no matter that the Constitution says no. Interstate Commerce is defined to include much more than interstate commerce. So how are we going to all of a sudden ask our government accept the limits of the Bill of Rights when it comes to spying on citizens?