Mr obama worries about the defection of conservative democrats in battleground states .
奥巴马担心在战场的州的保守民主党员的脱党。
The defection of people from other parties would bring welcome organising skills .
其他政党的脱党成员也会带来一些有用的组织能力。
Life becomes dangerously insecure when new technologies , innovations , and ideas increase the scope of defection .
当新技术、创新、想法加大了人们背叛的范围,生活变得极不安全。
If we can increase the benefits of cooperation or the costs of defection , we can induce people to act in the group interest -- because it is also in their self-interest .
Worse still , by the time that society realises the scope of defection has increased and societal pressures need to be increased , irreversible damage may already have been done .
更糟糕的是,到社会意识到背叛的范围已经加大而需要增加社会压力时,不可逆的危险可能已经发生了。
But in general , societal pressures work as a delicate balance between cooperation and defection : too little societal pressure and the scope of defection becomes too great ; too much and security is too costly .
Dreber , rand , nowak , and drew fudenberg of harvard 's department of economics recruited 104 boston-area college students to participate in a computer-based prisoner 's dilemma game that was extended to include costly punishment alongside the usual options of cooperation and defection .