I agree that there are risks with a cashless society (especially from a privacy perspective), but it's not incredibly hard to understand the positive effects of cash-free (as you seem to suggest).

- Vendors not needing to carry cash, significantly decreasing (or even eliminating) security-related risks (e.g. grocery stores/bus drivers getting robbed)

- Removing PoS that affect quality of service for the actual service provided (e.g. someone paying the bus fare and holding up the ride)

- Reducing the possibility for criminals to launder dirty money (the flipside of the privacy aspect).