But seriously, why do rich Criminals always come here and think they can get away with it just because they're rich? We arrested the child of Gaddafi. The son of a literal fucking dictator in charge of Libya, a country that is fairly important in European politics.
If not even he got away with it, what makes you think you will?
If you're asking why wealthy people run to Switzerland specifically I have to assume it is in part due to the history of banks that make disclosing ownership a crime making them useful to hide capital in offshore accounts to dodge taxes in their home country, stash money related to crime or exploitation, laundering, etc. While their money may be stored anonymously once they show up in person they themselves are no longer anonymous and subject to arrest.