Do you believe that privacy for banking should not be allowed? Because your post reads as such? Switzerland is an excellent example of a country which is highly stable (past 500 years) near zero interest rates. Highly trained and armed populace (14 soldiers per square km versus the USA <1) They maintained neutrality during ww1 and ww2 and have continued.

Banking privacy is very important, why should anyone know how much money I have after I declare my income for a given year and pay taxes?

why should anyone know how much money I have after I declare my income for a given year and pay taxes

and there's the rub. The main reason people love bank secrecy is it allows them to hide income.

Why not?