Tax havens vulnerable to the destruction of the wealth held in them?

It seems like destroying the records and back ups of the wealth held in these off shore tax havens would give the global rich a pin point haircut on unjust enrichment and provide some social mobility and encourage transparent taxed wealth instead of theft and law breaking. After the austerity fraud where a lot of the people’s money has been stolen and placed in these illegal accounts it would seem like justice. Seems like the Mr. Robot plot.