How does what make those go away?
Matthew Murdoch
This is admittedly only a half-answer, but I think the primary error regarding nihilism is granting right from the get-go that it should be considered the default position…
This seems to me to be his main point. To a nihilist, potentially at least, it may seem reasonable to consider nihilism the default position. Nobody knows. I claim not to know so this is a default. I am being epistemologically parsimonious. And that means this is a better position.
To put that another way, some nihilists think that what you call objectivists are making unjusitified assumptions SO nihilist is the default.
He denies that it is or should be the default.
I think both the nihilist who assumes it is a better default and this guy have reasonable points.
One way I would come at the issues is to say that beliefs are not as important as actions, which are in a sense beliefs with direct effects. Unless the nihilist manages to withdraw from all human contact - and even that is an act with consequences - they will affect the people around them by their speech and behavior. Nihilism in the head is not an objectivism. But any nihilist will choose certain actions, and likely with patterns, and avoid other actions - again with patterns - and all this will have effects.
My point is that one cannot avoid being a de facto objectivist, whatever beliefs bubble around in the mind of the nihilist. I would argue that this creates a ‘what-might-as-well-be’ objectivist morality. You have patterns of interaction that you prefer and these patterns affect people.
Perhaps you are less dogmatic, perhaps not.
And objectivist can value humility, not using power over others, seeking to find compromise, etc. A nihilist can have patterns of behavior and speech that fall into any type of interpersonal tactics.
So, while the nihilist on paper or in the mind may not be an objectivist, they still act like an objectivist, in the sense that they have patterns of human interaction that affects other people (for good and for ill to evaluate as an objectivist, pleasantly or unpleasantly to evaluate as a hedonist, and so on).
We can’t avoid having these effects.
So, is nihilism more parsimonious. In the head, potentially. On paper, potentially. But in reality, on the ground, in interactions between people, no.
Others are still dealing with someone with interpersonal habits who either vote or don’t who try to make things, at least locally and perhaps in general, as they prefer.
Regardless of our meta-ethical positions we directly affect others as if we have objectivist moral positions, in that the effects come from patterns we maintain, until we don’t.
EDIT: Another way to look at it not necessarily being the default is that if one argues it is better to have as the default, then it’s an objectivism. If one says there is no way to tell whether having an objectivism or not having one is better, then there is no default, according to that nihilist. There’s no ground to assume or prefer nihilism.
Of course, one can simply find oneself a nihilist, but what is there to talk about at that point. Curiosity might lead one to questions others, but mere curiosity.