Why would law-abiding citizens need untraceable, anonymous cash (which is used in 99.99% of crime). This is not a good argument. There are plenty of uses for privacy beyond crime. It is the equivalence of the 'you have nothing to hide' argument, which is total authoritarian bs.

'I have nothing to share'.

Whatever a law-abiding person does. We should not be subjected to total government surveillance because someone somewhere might evade taxes or launder money. We fight hard to maintain our privacy in all fronts, there's no reason for finances to be any different.