it is clear when you look at ecosystems for example, if a single disease can wipe out all adult trees in a forest it kills all new sprouts and it stops being a forest. (Tree sprouts tend to not do well in direct sunlight because they expect the shade of trees above them and all that)

so if you only have one kind of trees you are on a timer

this is the same with how we interact, and why organizing in systems that can coexist with as many other systems as possible is a requirement for survival. This is one of the biggest reasons why I'm an anarchist, because the point of the state is to force everyone to exist within one set of rules and such