They lose their ability to think clearly.life thretening situation is also a highstress situation, stress can disrupt synapse regulation, resulting in the loss of sociability and the avoidance of interactions with others or anything in general.
Especially if the case is one in which other people are also trying to survive yes.
Some would not nescessarily call it selfishness, it would be more of an act that you have to, I see it kind of like self defense. It is not completely selfish, but a human has the instincts and knowledge to always survive, sometimes at the cost of being called "selfish"
Thus, the loss of sociability and the avoidance of interactions with others or anything in general.
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