Just about everything good is correlated, and also everything bad. We could also talk about the correlation between attractiveness and good health, or between IQ and healthiness, which surely works both ways, as well having common causes.

Sometimes when try to draw the casual graph, you find that it’s fully connected. There are all sorts of reasons for connections. It would be unusual for a correlation to be exactly zero.

But because people vary, it doesn’t mean that this sort of reasoning works well for individuals.