I believe that in a Social State everyone should be granted a minimum condition of living in such a way to make them useful in our society, but that is another complete different question.
Tax is the government instrument to finance itself and to redistribute richness.
It main objective is not to finance State machinery or redistribute richness. I will try to explain that in plain language. A really small fraction has something to do with music or arts. From these tiny percentage, another small fraction is really related with copyright questions. If you make all buyer to pay taxes on hardware purchases what you are actually doing is transferring richness from consumers to artists without justifying such transfer.