Does anyone have insights or a perspective on the possible biological roots of PA behavior (or disorder)? I am not a psychologist, psychiatrist, or biologist, but when I think of the evolution of the species it kind of seems obvious that the mammals lived a hard life under the dinosaurs' feet. Then other large predators like the birds replaced the dinosaurs. Moreover, it seems justified to think that primate species tend to be among the weaker mammals. Overall, humans have far more frightened ancestors than frightsome ancestors. (In contrast, the domestic chicken's lineage includes the mighty dinosaur! Anyone else see an irony here? In terms of our collective subconscious, can this be an explanation for the chicken's top slot on our menu?) My conclusion, based on the above premise, is that humans' evolutionary past must have reinforced the type of behavior patterns (as survival traits) that may be similar to what psychologists call passive agressive behavior. Example: since a direct confrontation with a dinosaur was unlikely to end in its favor, the small mammal did not openly challenge a dinosaur's territory. Instead, it fled and hid in a dark corner of the said territory (or just outside of it) and waited for a chance to sneak into the dino nest and devour the dino egg. It thus undermined the dinosaur's very existence in a non-confrontational way. Kind of like partisan resistance or guerilla warfare, which are passive-agressive war methods. Has this been thought of before? Researched? Or am I far out?