Oh Patriot...
Why do I bother? It's like talking to a rock.
Taxes fund governments they are necessary evil as well as part being a memeber of a society.
A graduated tax scale is a matter of morality and practicality.
Morally,
Say the tax is 10%.
For a person that makes $100 a week, the $10 he gives up are much more vital to feeding his/her family than the $100 a person making $1000 a week would give up.
Practicality,
The government must have funding to function. Squeezing a nearly empty tit (the person that makes $100 a week) only provides drops. The government must take from those that can most afford it to fund itself. Also the richest need to give back to the system that allowed them to reach their finacial success to aid the poor, if not they poor become an expense and a danger. That is an expense by means of welfare, unemployment benefits, etc, and a danger because poverty always creates increased crime levels, increased crime levels mean fuller jails which means one more expense.