Conservative != Conservatism. Conservatism is the dominate ideology the U.S. was founded on: you get no representation or political participation unless you're a man + white + own land. That is landed elite aristocracy, straight from old Europe. Not news.
A more recent example of Conservatism is Nixon's southern strategy as told by Lee Atwater in 1981. Today's Republican party is the same as that. No matter how you cut it, the Republican party is the political branch of neofeudalism. That is it's entire history: conserve the fact that classism is good and should be preserved, we do not serve the broader public.
Senator Grassley: Ending Estate Tax Recognizes Investors Over Spenders.
Republicans want to preserve the aristocracy they represent. That's the sole charge of the party. Liberalism fears aristocracy, it breeds contempt and unfairness in civil society, and its prevention with a simple and unavoidable tax is how a civil society is preserved.
The very fact you think there is a balance to make sure aristocrats don't end up with all the marbles suggests a distinctly Liberal perspective. That would never fly in Conservatism. You're simply confused about the meaning of these words - this is basic political science so if you haven't had that, you wouldn't know it, but if you've had even a year of undergraduate study you'd know it. It's pathetic we don't teach this stuff in grade school but it's too "political" hilariously enough, so most elected school boards in the country end up requiring the teaching of selective patriotic propaganda bullshit, rather than basic political philosophy and history.