Cooperation is different from fanaticism and homologation, where every individual must conform to a unique idea, lifestyle, cult, imagery or human mechanization, where job and life dynamics are standardized like in the industrial revolution factories. The natural anthropological tendency of human groups to split community tasks into roles adapted to personal skills has been one cooperative aspects which permitted mankind long term survival. Moreover, even in the most uniforming tyranny, human beings maintain their differences: diversity is a golden gift, but it can generate the most horrible conflicts when not integrated or misunderstood.

Anthropologically mankind reached high levels of survival and wealth also thanks to the natural tendency to pursue and develop different personal skills, generating the possibility to have more roles and functions for every participant of the community. Probably we are the most diverse and role-differentiated creature on earth.
The determination of different roles is needed to create a good climate: individuals need their personal identity in the group to be acknowledged, so that specialized individuals accomplish mutual goals and share mutual benefits, according to their role and activity.
Diversity is unfortunately a generator of misunderstanding too: our habits and mindset could be different than those of another human being, even the most relevant to us. That’s why we should think about diversity as a pre-existing potential and not as a real condition.
The more cultural appreciation and inclusion is diffused, the more differences are becoming a pleasurable feature in communities and individuals, who seek diversity in neighbourhoods as an important factor in their preferences.
Diversity, moreover, needs its space. That is why open-space technology, unconferences and hackatons work well: every individual sets his identity-based space and who wants to join that space cooperates with that individual. No identity is forced to any path or activity. When diversity has the right space to express its identity then feelings related to other conditions like freedom, trust, care, equivalence raise as well, enhancing the cooperation.
More technical aspects:
The presence of neutral individuals in the system comes from game theory and refers to a complex events cycle in which cheaters and competitive individuals tend to lose more and more advantages until they change strategy, because there are neutral individuals who independently produce benefits for themselves that become a better choice for cheaters and competitive ones when their strategy produces negative effects – like when they are excluded from a collaboration in which they “cheat”.
The Delphi-stlye methods, in which the process is revised independently and then re-aggregated, or some similar methods in which diverse people independently contribute to the problem solving, can give enough decentralisation, independence, coordination and re-aggregation of the ideas so that diversity does not generate conflict but higher levels of innovation and subsequent wealth.
Even if there is doubling of processes and roles, in cases of collective intelligence, the operation gets a valuable diversification of results anyways.