One of my biggest concerns with the fair share argument is that it almost never outlines what a fair share is, besides a strong implication that the present condition of things does not fit the definition. Anyone who can articulate an idea of what they would consider to be fair, in terms of actual numbers, earns almost infinitely more respect in my book. Saying a number indicates that, in your view, there can ever be a fair accommodation. Frequently, this talk is nothing more than mush mouthed class warfare shit, with people who can not see any fair solution. So maybe we disagree on the magnitude of taxation, but I respect you enough to be curious about what you think.
Is your proposal that the tax percentage paid should be roughly pegged to the percentage that their total income represents of all income in the US? Say the total income earned in the US is approximately 1,000,000,000/year, and someone earns $50,000/year; their tax would be c*(50,000/1,000,000,000)%... is this correct?