Roths are like nothing in comparison with the total pool of already taxed money - besides Roths it includes savings AND the capital cost basis of every taxable investment in the country. And the double taxation fraud would apply to all of these, not merely to Roths. So it's a bit more than a "grievance".
So, because we won't get refunds for taxes already paid to investment accounts, we should continue with our insane system? That's like saying that you paid for a hamburger, to be picked up some time in the future, and now you have a chance to save enough to buy a thousand hamburgers, but must dcline because you want the hamburger you already paid for. I'll take the thousand...
... but not much more - in fact, it isn't even correct. See the link in post #36 to see why.