That's just an axiom for me, no justification needed. My life is my life and it is not the business of the state to watch every step I do as long as I am not affecting others in any relevant way. You convince me that I or society as a whole would be better off if I allowed the state to constantly keep an eye on me, then I might change my opinion and grant the state the permission to violate my privacy.
That's nonsense, every worldview must be grounded in some axioms, that does not make it a religion. I can break it down somewhat more for you. The state has no powers besides the ones granted by its citizens. I value my privacy highly and need very good reasons to grant the state permission to violate it. Catching criminals does not clear the bar, there are other ways to do this that do not violate my privacy.