Correlation is not causation.
That seems like it should be obvious, but in too many cases, otherwise rational people ignore the obvious – largely just because they want to. This is seen in diverse public policy topics, such as Climate “Science,” Constitutional Law decisions, and the benefits of stealing from the rich to give to the poor.
I came across a website with numerous graphs of ridiculous correlation, which I thought you might enjoy. The graphs didn’t cut and paste well, so instead, here is a link – it is well worth the few minutes you’ll spend. http://www.tylervigen.com/spurious-correlations