> The examples I gave were meant to show that the behaviours that one believe to be "fitting" for a certain worldview, is suddenly not "fitting" in another group.

I think this is where we have different viewpoints. To me, a guiding principle that exists like "optimize for survivability" isn't something that people would actively agree to, hence to "belief" is required.

It is like saying "not everyone believes in gravity, yet it still exists"