The number is not necessary here. Not because the chances of being murdered by law enforcement impersonators is out of the question, it does happen. It's just that Swiss lack the media beat-ups, hollywood brainwashing, and general ignorance to believe that they almost certain to be victims of some terrible criminal act.

Therefore, such a service is would be wasted here.

P.S. In Europe generally, you'd probably have a better chance of coming to grief at the hands of real police, not imposters.