Answer: large income inequalities are bad for a democratic society
Explanation:
The primary moral argument of critics of a regressive tax system is that the large income inequalities are bad for a democratic society.
A regressive tax is one that lowers the average tax burden as income rises. Low-income taxpayers have a disproportionately large percentage of the tax burden, whereas middle- and high-income taxpayers bear a disproportionately small cost.
The fundamental moral argument used by opponents of a regressive tax system is that significant economic disparities are harmful to democracy.
Therefore, the primary moral argument is the income inequalities.
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