That was no explanation at all then and isn't one now.
Clearly, most people don't 'know it when they see it', because most people do not have ESP and are not privy to the motivations of the player behind the CMDR they presume to be a 'griefer'.
Except it is the perfect explanation for something that cannot be neatly standardized and quantified and is subject to interpretation.
Back in that time (circa 1954) the subject was Obscenity. Classical works of art, such as Hieronymus Bosch’s “The Garden of Earthly Delights”, Francisco de Goya’s “The Nude Maja”, or even Katsushika Hokusai’s “The Dream of the Fisherman’s Wife” were not characterized as Obscene, despite their depictions of nudity, and these pieces were on public display in museums with no social outcry. Yet other works, including Hugh Hefner's Playboy (#1, December, 1953), were considered Obscene, yet fought to defend their position as a modern form of artistic expression and sought protection under the US Constitution.
While the subject matter here differs, the concept remains the same - quantifying and classifying what is a highly subjective term.
If we cross paths in space, and I open fire on you, destroy your ship and send you back to the last station you were docked at, am I "griefing" you? Probably not, even if my own reason for doing so is simply to derive my own pleasure at your expense.
But if I then set a course for that same station, and meet you at the edge of the no-fire zone and destroy again, and again, and again, and again, while deriding your abilities, peppering you with insults, there's going to come a point, very quickly, where, despite the pleasure I am deriving from your plight that my actions are no longer within the confines of normal game play, but constitute what can only be called "Griefing". Yet this is still a subjective term.
As Jean Rostand put it: "
On tue un homme, on est un assassin. On tue des millions d'hommes, on est un conquérant. On les tue tous, on est un dieu."
(Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god.)