It's not the behaviour that is unique to humans; it is the ability to act counter to instinct, counter to appetite, to choose and be aware of the consequences. We alone can be held accountable for our actions.
I'm not implying that needless killing is the only, or the main thing that sets us apart from animals, except in the context of the comment I was replying to (about lions feeding on an impala). But it's taking this kind of actions despite having the ability to be aware consequences that makes us special. You would expect the threshold for some of these actions to increase with these newfound abilities but it went the other way around. A person is willing to kill a last member of a species not for survival but for little more than a trophy on a wall.
There are probably far more things that set us apart from animals than instinct or awareness of consequence. Most children actually lack these abilities because they are partly taught, they have to be groomed. So the main difference might be that we are able to learn up to a point that no animal can rival us. This is the perfect example of what a human can be without "learning": https://en.wikipedia.org/wiki/Oxana_Malaya
Anyway, if you are out of luck I hope it is not because you are lucky.
Regardless, I hope the idea stands.
If necessity was a generator, a vector or force for movements or actions, then I could understand that use of "out of". Out of indicates the result produced by a force, algorithm or oracle. But I consider necessity not as a generator or force but as a passive state. Hence I wonder what is the mechanism for this use. If we collapse the concepts of passive and active then I think language get corrupted and poissoned. Analogies are not fruitful because they go far beyong the logical ground. I believe that if you are going to get something out of a state then that state should be a generator. I don't know if what I am trying to say is sound but I sharply feel the unsoundness of linguistic non logically generated derivations
Perhaps that kind of mental state could be used for sentiment analysis. The probability of that use of "out of" increases when you are in a mental state that promotes flipping active and passive states. For example, when you not any longer want to cope with your actual state, going to extremes: you put yourself in a fight for survival state that promotes a revolution by beating the slavery chains.
Edited many times.
> You should use "because of" in cases like this when the thing in question is the catalyst for something to happen, and use "out of" when the thing in question metaphorically "gives rise" to something else.
[1]: https://ell.stackexchange.com/questions/115445/can-i-use-bec...
For the purpose of the comment "out of need" felt a lot more appropriate for an animal that kills.
Where are you from? / Where are you out of?
"Out of luck" is weirder. German has ausgehen to mean "run out" (as in "our supplies are running out"), but it's not quite the same...
(Also, fwiw, you could also say “they kill because of need” or “they kill because they need to”, so because works in English as well)
The grammatical nuance between out of need and out of luck (nice find btw) would be doing (out of need) vs being (out of luck): you might win out of luck, and later lose because you are out of luck. Wastefully spend out of wealth, then be out of wealth, and so on.
Although there were possible health factors that drove these lions to preying on humans, I find it an interesting aside to this conversation.