You are fundamentally misunderstanding that a sales tax is a tax on the customer not on the seller. This is because sales taxes are fundamentally use taxes with

You are fundamentally misunderstanding that a sales tax is a tax on the customer not on the seller. This is because sales taxes are fundamentally use taxes with the compliance burden shifted from the customer to the seller. You can argue against reality all you want, but it won't change decades of history, nor will it change how the world actually works.