Millionaire only when the tax man comes calling is quite a bit different than Silicon Valley millionaire after an IPO.
Nobody wanted the estate tax to mean "the government gets 10% of Wal-Mart when Sam Walton dies". If that's the outcome that results in some cases, then fix that problem.
The North Dakota farm issue was interesting, as something I wasn't aware of (and thank you for bringing it up!) I'm less interested in engaging with the general libertarian argument against taxation.