Exactly so. High trust societies are much more efficient because we don't all have to (metaphorically) squat in the dirt guarding our meat. This frees humans

Exactly so. High trust societies are much more efficient because we don't all have to (metaphorically) squat in the dirt guarding our meat. This frees humans up to divide labor efficiently, spend time on higher order problems, etc. What it is that leads to high trust societies (cultural homogeneity, common religious convictions) however, is an unpopular area of studies.