[typednothing]

Could a rule like "Everybody must go up to the 12th floor, jump out of the window, and die." be part of morality? No, because that would be self-defeating. In the same way, demanding that people pay a tax but not fixing at all how much that tax should be, is a broken rule, and cannot be part of morality. Nothing will stop the ruling class from incessantly increasing the tax rate, if you accept the rule. Therefore, the rule must be rejected.

[jcfrei]

Your argument only works if society gets nothing in return for paying taxes.

[tdb7893]

The rule would be bad for morality because the outcome of it is bad. I'm not sure that the same can be applied to paying taxes