It looks like the flat tax continues to appeal to folks in Eastern Europe. Note a couple of points in this article:
"There's a common misconception that all forms of flat tax place undue
burdens on the poor," said den Haan, a professor at the University of
Amsterdam. "In many cases, only incomes above a certain threshold are
taxed, which can make the system quite progressive," he added.
"Taxpayers [in Western European countries] also like the idea of exemptions and the feeling of getting
money back from the government, den Haan said, adding that people can
see how specific exemptions benefit them and don't want to lose those
benefits."
This last point is made clearly in The Rats are in the Cheese. Politicians have addicted many voters to the tax code by loading it up with special benefits and deductions. Now, when any tax reform is proposed, many taxpayers reject it out of hand, fearing they might lose their particular "tax goodie." We need some 'taxpayer methadone' to help alleviate this addiction.