Argument: There is strong public support for progressive taxation
Tapan Mitraa, Efe A. Okb, * and Levent Koçkesenb. "Popular support for progressive taxation and the relative income hypothesis". Science Direct. 13 July 1998 - Abstract: We show that a marginal rate progressive tax always defeats a marginal rate regressive tax under pairwise majority voting (so long as the latter collects at least as much revenue as the former one) irrespective of whether the voters care at all about their relative incomes or not.