Not to hammer a dead horse, he was already into his 80s, and how many of us can remain particularly sharp or clear-headed at that age, let alone still remain alive ? I don't think there's any male member of my family who has lived to see 80, perhaps save one.
"Libertarians aren't true conservatives."
There are some basic issues with which we share, but a lot of basic differences. Not to paint them all with a broad brushstroke, many are not the lunatic fringe, but many are. I personally have not had a good time with them in onlineland, and participating with them in political Sims was a very harrowing experience. I served as a Republican Senator in one about the time an influx of Libertarians came in and took control of the caucus. I don't particularly appreciate getting called names like "left-wing statist", etc. when I voted practically the equivalent of a 90% ACU rating. They literally forced me to switch to the 'Rat caucus (and you know it's a bad sign when the 'Rats sound more reasonable, even when filled with hard-left Socialists, then the Libertarians).
The Libertarian philosophy will never amount to anything in American politics. Actually, on social issues, libertarians have much more in common with liberals, then they ever will have in common with traditional conservatives.
Libertarians support the ethical theory that achieving one's own happiness is the proper goal of all human conduct. That is called egotistical hedonism and shows values and beliefs, that lack of a moral compass.