I find your distinction between matters "practical" and "moral" to also be disingenuous. Are not all systems of taxation fundamentally based in some moral code's definition about what is a 'fair' tax? [Admittedly, in the degenerate case, the code is "might makes right".]

It's perfectly reasonable to have disagreements about the moral bases of tax codes. (or other morality-related issues). It irks me when folks behave as if their particular position is empirically and obviously correct, without acknowledging that it is only 'correct' within a specific (and arguable) moral framework. Especially when I happen to disagree with that moral framework, of course. ["From each according to his ability, to each according to his need" is... a reasonable description of my current opinion, at least in terms of economy and taxation.]