@djjd62,
A flat tax is regressive, and is not 'FAIR.' Taxes should always based on people's ability to pay it and still "live."
An individual making $10,000/year who pays a flat tax will leave only $9,000 for survival. Do you know how many can survive on $9,000 in the US?
A wealthy individual earning $1,000,000/year who pays the same 10% will have $900,000 to "survive." If his income is based on the opportunities provided him in this country, why shouldn't they pay a greater share of their income to taxes?
If you are capable of playing around with numbers, apply any flat tax rate to a range of income and see if it makes sense to you. You'll find that those earning poverty wages will not be able to survive and provide for their families.
Balance that against the amount our country spends on our military and domestic security, and you'll begin to realize that the wealthier people have more to lose from terrorists and terrorism against the US since their assets are worth much more. They should pay more for our security.