Since it is not clear to you this means you have only examined the situation superficially. In case you didn’t notice I specified “federal income taxes” since many of the other penny-ante taxes you concentrate on are well hidden or often trivial so the average dumbass not paying income taxes doesn’t even notice them.
FICA is only “universal” when the payer is WORKING. A large percentage of those not paying any income taxes are NOT working. And FICA rarely goes up. In fact, at present it is not even being collected. And it is one tax which is generally repaid many times over when SS benefits are paid.
Since the parasitic 50% BELIEVES the income tax only impacts those who deserve to have their money confiscated there will never be sufficient numbers supporting reducing or eliminating it. This group is why the Democrat Party still exists.