Is this push for more Government authority to pursue potential terrorism valid or does it compromise 4th, 5th and 6th amendment values to an extent that cripples if not eradicates them? 

In the attempt to properly balance security and liberty in the post 9/11 period: Is this push for more Government authority to pursue potential terrorism valid or does it compromise 4th, 5th and 6th amendment values to an extent that cripples if not eradicates them?