That is also how things wind down and progress ceases and civilizations decay. You need a measure of conflict and difference to move things forward.

I do agree however this needs to be controlled and within bounds so as not to be totally destructive and also because you can't get anywhere with everyone pulling in different directions.

In evolutionary terms, variation is the basis for natural selection. You have no variation then you have nothing to select from.

Inter-communal trust sucks only when you consider well-being of a larger community which swallowed up smaller communities. You just created a larger community, which still has the same inter-communal trust issues with other large communities which were also created by similar swallowing up of other smaller communities. There is no single global community.