How do you know what to fight against until it appears and is defined?
The isolated tribe cannot defend against the capitalist hegemonic state until it grasps the model of destabilization and desire introduced from the contact. (How could you imagine this in advance?)
While you can target all outsiders (strangers) as enemies in preemptive defense, the more subversive model is a subliminal natural desire.
For instance: The oedipal complex names your unconscious desires, allowing you to defend and socialize against them.