no taxes would mean no public health care etc. non progressive tax rate would mean too high taxing for those who doesent make as much money as the 1% of the people who are rich or if the tax % was set according to the people who doesent earn much, government would lose a lot of money from not taxing rich people more, thus leading the country to not be able to afford public health care etc to people who actually need it(the ones who doesent earn much).
in short non progressive tax rate would benefit the rich a little, who are the minority and poor(the majority) would suffer. therefore, even tho some selfish rich bastard is crying about injustice of him having to pay bit more taxes than some guy flipping burgers at mcdonalds, its in reality more injustice in larger scale for him not pay more, because majority would suffer from his greedy ass "my precious" cash money attitude.
so its really about whether you look at larger % of people who suffer or individuals who suffer. if you look at the % it would be injustice to not have progressive tax rate or the benefits from having taxes in the first place. or you can look at one guy crying about their already large income being limited. imo if someone who is wealthy and cries about getting taxed more, can move out of the country to some other country that doesent tax at all or stay and stop crying.