Two critiques:
1)inflation is running quite a bit higher than gov't figures. Did they use core or CPI?
2) 'Regression to the mean' is a statistical phenomenon for population groups. The widest outlyers tend to gravitate towards the mean over time (the bar graph distribution suggest this). Not really surprising that the poorest and richest incomes swing the most
In regard to taxes, it's true that the wealthy pay much more $ in total, but not as a percentage of total income. They pay less. Warren Buffet has offered $one million to anyone who can prove otherwise
http://money.cnn.com/2007/06/26/news/newsmakers/clinton_buffett/index.htm
I'm a republican, but I think our tax system is grossly unfair to the poor and middle class, esp now with AMT hitting more and more people