Correlations, or associations, abound in life.
In the year Justin Bieber was born, cholesterol levels began dropping. In the year Facebook was invented, they began rising again. So, there's an association there. If Facebook got rid of Justin Bieber, would Facebook finally succeed in its evil plot to send cholesterol levels sky high?
Correlations are the starting point for investigation. Next, the arrow of causality must be established. Does A cause B? Does B cause A? Are both A and B caused by a third C factor? Is it just a coincidence?
This is why science is awesome. It keeps us from making causal associations when there's none there.