The Fourth Amendment is a fundamental cornerstone against tyranny. Giving up privacy to a tyrannical authority leads to imprisonment based on any nonsensical argument of probable cause.
The reason so many think there is nothing to fear is not because government is beneficent or benign. It is because government has been constrained and freedom allowed to flourish. Take away the Bill of Rights and watch how quickly the opposite reality develops.
With all three branches of government in agreement that this stuff is just fine with them, we may see the opposite sooner rather than later.