What does "Un-American" mean in the context of the estate tax?
You say the estate tax is that. Do you think the income tax is Un-American? We didn't have one for the first seventy years of our country.
Perhaps you just don't like taxes at all?
I mean it is wealth that has already been taxed. The simple act of passing it along to someone else, in my view, shouldn't be a taxable event.
Part of this countries DNA is an aversion to kings, royal families, aristocracies, etc. Self made success stories are the red meat of our particular national pride.
As such I strongly believe that hard earned money should be taxed less, not more, than easily gotten money. So in my view capital gains should be at least as taxed as wages, probably more, and inheritance or other windfalls where your new found wealth is not the product of your labor should be taxed heavily to assure that we don't end up with more of an aristocracy than we already have.
Consider the opposite for the moment (i.e. our current situation). If your grandpappy saved hard and got rich investing in stocks, and your father didn't eff up the estate you can just keep riding out the investments without having to lift a finger your entire life. Did you do anything to help your grandpappy make or grow that money? Doubtful.
Meanwhile the kid born next door who's grandpappy and father just scraped by working a little lower pay jobs (or simply had a bout or tow of poor luck) has no inheritance coming. He has to work his butt off just to tread water these days.
The ladder has largely been pulled up by the rich set. Those who are rich beyond belief actively lobby congress with their estate's resources to lower taxes for themselves, they speak up and shareholder meetings to demand lowering of costs that result in offshoring, and generally prioritize reducing benefits to the masses to enhance their portfolio. Those who have been rich for generations often have no concept of what it is like to actually start poor and build wealth up in the face of all of this.
After all, who needs money more right now, the Koch brother's heirs or impoverished kids facing badly funded schools, poor nutrition, exploding college costs, and doing so while growing up in high crime areas?