It is not a death tax, it is an estate tax. An inheritance tax.
And the "double taxation" argument is a shell game.
What is abjectly arrogant is to assume you don't owe government a dime. Government provides services. We pay for those services through taxes. It's too bad that upsets your libertarian view of the world. So what if government allegedly gets "first crack"? If you own a home or rent an apartment, the mortgage company or landlord gets a whack of your paycheck. If you lease a car or have a car loan, the credit company gets another whack.
You like being in this country. You like the fact a stable business environment, the road transportation network, the law enforcement services, etc. You gotta pay for it.
You don't put quarters in the faucet before getting water. You don't pay a toll once you get on a public street. You pay for those with taxes.
And your defense of the poor oppressed upper class is noble.