Earlier quoted context omitted.
This obscures the tax burden from the end user, transparently blending it with the price of the goods and the merchant's profit. Consumers should be consciously aware of the split.
So, the same reason we can't have the convenience of pre-filled tax returns from the IRS? People need to be able to feel the pain of the taxes they pay, because it might help bring them closer to the ideological conservative viewpoint.
If the taxes are silly and ridiculous (which many are), then they should be rolled back and people should know about them. That's not conservative, it's just common sense.