A creature unable to form a viable society cannot form a viable society in order to deal with whatever it is that prevents them from being unable to form a viable society. That is called logic, it is not a fallacy at all. It is an example of "one cannot build a house with no bricks", beings unable to cooperate cannot cooperate in order to be able to cooperate. If the moment the first goblins get together they immediately *have* to hurt each-other and consequently end up killing each-other due to the resulting hatred, there is no goblin society.
Actually this a very strong argument FOR the idea that goblins "must" be cruel when you think about it.
After all, as the current game goes it is
impossible for goblin civilisations to form without a literal demon raising a fortress straight from actual hell to rule them, if I'm not mistaken. So the society is not being formed by the fractious creatures that could not create a stable society, it is being created by a magical being of great power to enable it to rule over them.
And when you look at classic fantasy that's a pretty common theme. The supreme commanders of orcs/goblins are very often
external beings who either created their society, brought it to prominence, or in some cases actually created the species as servants.
I still dont think goblins should have a biological imperative to be assholes, because thats un-fun, but its an interesting thought