My point would be that since I already have 40% less money than I would have had in the absence of taxation, it seems that I have already endured my fair share

My point would be that since I already have 40% less money than I would have had in the absence of taxation, it seems that I have already endured my fair share of the tax burden. (For simplicity, forget about progressive taxation and assume that flat taxes are fair. Just compare me with the guy with a $50k salary who also gets to keep $30k of it.) As with everything, it comes down to an argument about what's "fair".