Correlation is not causality in Doctor Who

A thought for anyone who enjoys Doctor Who and false logic:

The mother of every companion in new season Doctor Who thinks that the presence of the Doctor means trouble. They believe that the Doctor brings trouble with him. In fact, as the audience and companions know, the Doctor constantly saves others from the trouble that is already planned. While trouble and the Doctor are positively correlated, the concerned mothers are wrong in believing that there is causality.