Bruce,
The lower and middle income people pay a much higher percentage of their income in taxes than the rich do - especially if the rich get most of their income via inheritance or interest, dividends, etc. (This disproportionality is exacerbated by things that the working class and poor buy which are taxed.   How fair is it, for example, that if you buy a car you pay sales tax on it but if you buy a car company you don't?) The rich - big businesses, at least - use a disproportionately large percentage of the public's money, by way of the legislatures, courts, etc.

~ How can one group pay ALL the income taxes and another group pay 40% of them?

And you're aware, aren't you, that many wealthy people and corporations pay no income taxes whatsoever, because of loopholes, off-shoring, etc.?