Over time, motivations to cooperate and to avoid defection can be analyzed jointly

Evidence

I shall speak of motivations to cooperate, and their possible sources, sometimes to refer to motivations someone might have to become a dependent party, and sometimes to mean the motivations of non-dependent parties not to defect. They are two different sorts of thing. But once we leave the one-off case, and consider properly the implications of social practices of cooperation, and if we grant the empirical assumptions I have just mentioned, we are entitled to treat these two different things together, because they will, usually and for the most part, exist together — where ‘together’ means (as we have already seen) ‘together in the same society’, not necessarily ‘together in the same person’. — Diego Gambetta, Trust - Making and Breaking Cooperative…, 182