Pretty sure that there are very few people who pay zero fed income tax that will ever have to worry about the inheritance tax but whats your point? None of that pays for what we are talking about.
BTW, rich people pay all of that stuff too and for some reason that is never included in the percentage of taxes they pay. Why is that? If we are going to compare stuff, why wouldn't you do an apples to apples comparison instead of changing what is counted depending on the group?