[troutwine]

Keeping just to the utilitarian perspective, cooperative strategies in humans overwhelmingly have better outcomes in both individual well-being and output (innovation, manufacturing, zero-sun games). Cooperation is extremely hard to achieve and sustain without some empathy for your peers. Similarly, judgement runs counter to group cohesion, except in the divergent strategy of establishing an Us/Them dynamic, sustainable in the short term but leading to homogeneity, worse outcomes.

Tossing the utilitarian perspective, being transactional and self-serving in your daily life tends to get you invited to less parties.