The evolutionary benefits of war are that land and resources which benefit survival can be gained and also increased access to females, thereby improving a mans chances of reproducing and passing on his genes.
HOWEVER warfare is a risky strategy as it can end in serious injury or death. Forming coalitions with others is therefore seen as an adaptive response as it reduces these risks. Groups are more powerful and offer more protection therefore increasing chances of survival. Not only can resources be acquired, they can be protected more easily by friightening of potential attackers. Furthermore, men who are more aggressive and strong are more likely to win fights and therefore survive to pass on genes. Also, men who are successful in battle may appear more attractive to females increases chances of reproduction.
RESEARCH - Chagnon observed behaviour in the Yanonomo tribe from the amazon and found that the need for more increased access to women was a common cause of warfare between groups. he also found that successful warriors had more wives and children.
pinker found that abusing women from an opposing side was commonplace in WW2 concentration camps among Muslim women in bosnia, thereby supporting gene survival as driving force. However - according to evolutionary theory this should not be the case as they would want genes to survive, which is unlikely in concentration camp.
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