All human nature has its base in Selfish Gene Theory. Clearly there is diversity among humans - not all are equal, but all have enormous commonality.

The following may provide insight into humans and their behavior, and can provide useful behavioral predictors. Human behavior is complex, much of it is hard-wired, much of it is learned, but the fundamental patterns and desires that people fall back on are well established, and quite predictable.

When trying to predict what an individual will do in an emotional situation is to ask - 'what does Selfish Gene Theory predict they will do?'

See