Personally I'd agree with what you say about actionable, people have the impression of this reality, so that's what they act on,
Sure 'seems like we're tying our shoelaces when we appear to do so,
Also possible to explain exactly a method by which to tie one's shoelaces.
Murder though I'd call a bit like gravity,
Though only in the sense that a person or society would be likely to structure morality a certain way based on certain conditions.
Though it's lazy, I conflate atheism and nihilism a bit myself,
The method anyhow, that led to my loss of belief in Christianity, also led to my intellectual nihilism,
But person's got to be, got to act,
And to an atheist, this reality, our needs are real enough to compel our actions to go along with.
Have 'more an appearance or truth, than God.
Though I can understand a theist seeing it different.
. . .
@NoOneInParticular
Even if one makes an intellectual conclusion that one can't 'truly 'know anything,
Doesn't 'seem to matter much for a human,
Seems we make due with what we have then, form our conclusions and apparent truths,
Push back against what seems less likely,
Encourage apparent benefit,
Discourage apparent harm,
'Is that hypocritical?
Hm, right this instant I don't think so myself.