There could just be no connection at all. Like how there's a positive correlation between shark attacks and box office sales for Nick Cage movies. There might be some relation between them, but more likely there is no link and it's just random noise that happens to line up particularly well.

The reason why you might see it used as an end statement is because there is no data or clear logical link between the subjects which were correlated. It's basically saying "unless you have some reason to believe they're linked, you should probably assume they're not"