German tax officials purchased stolen account information[0] in order to pursue tax cheats. If you think that's acceptable within the rule of law, then what's wrong with gag orders and mass surveillance?
The responsible server administrator who stole the data from the bank has been sentenced to prison in Switzerland and fled. The second crime was committed by the German officials, but none of both has anything to do with swiss legal standards.
No, I wasn't referring to that very case, but how OECD countries signed and agreement with Switzerland to avoid tax evasion. Just Google OECD-Swiss tax treaty. Your outlier is not the norm.