The founding fathers weren't exactly the pillars of individual freedom you seem to think they were. They were an American centric elite and plutocracy trying to displace a Britsh centric elite and plutocracy, mostly so they could have a bigger cut of America's growing wealth.
You can tell because most of those constitutional protections and the Bill of Rights didn't apply to people who weren't affluent(i.e. who didn't own land), women, native American's, blacks/slaves and indentured whites. They applied mostly to white men who had wealth (at least enough to own land).
They actively prevented people who were not white, male and affluent from voting or holding office. They were mostly slave owners themselves, and they were for the most part very affluent and owners of very large real estate holdings. They were all 1%'ers.
The Declaration of Independence and Constitution were carefully designed to inspire support from enough people in the colonies for their Revolution to succeed, and to create the illusion of freedom, but they had no intention of relinquishing their power and control over the levers of government when it their Revolution did succeed. That plutocracy has never relinquished that control in the more than 200 years since.
The NSA along with the DHS, FBI, ATF and IRS are means for maintaining that control.
The Internet let a genie out of a bottle and created dangerous potentential for the rest of us to organize and try to win some of that power and control back.
When faced with the twin crises, and excuses, that were 9/11 and the 2008 crash it was nearly inevitable that The Powers That Be in the U.S. and U.K. would exploit every tool at their disposal, mainly computers and networks, to try to put a lid back on their control of their increasingly restless and networked homelands and to try to maintain their domination of the world as a whole in the face of increasing challenges.
The 2008 crash in particular resulted in widespread global disillusionment with the fact economies and governments are rigged to benefit the ruling elite and screw everyone else. When ruling elites start feeling that heat they trot out their police states, always have, always will.