Plainly, I don't believe in deterrence as effective or a substantial reason why most people don't engage in bad behavior.
60% of murders go unsolved because a sane murderer does not commit a murder that would be easy to solve. I'm sure many tempting, high-reward murders do not happen because they can't be committed without an ensuing police investigation.
Suppose 1% of people are currently criminals (I don't know the real number). Without an authority investigating and punishing crimes, that number might increase to 1.1% or even 2%. But a small fraction of those would likely increase their criminal behavior by an order of magnitude.