That’s Correlation does not Imply Causation – and its the blogger heaven of logical fallacies. Roughly, it means two (or more) events can occur without one being the cause of the other. This is a logical fallacy, but there is often wiggle room. Two causes may be present in a result in a way that is extremely suggestive but not proven to be 100% true – like obesity and diabetes. There could be some science that will prove the link one day. Or there could be yet some unidentified event – or numerous chained links of events.
This fallacy is very attractive. Our brains are powerful pattern recognition machines so we naturally want to connect the dots. Our brains love easily consumable facts.
And that’s why its the dope of political bloggers (or ideologues or any type) of any sort. If you share the politics of the blogger, you are already predisposed to agreeing to their arguments because they seem to know what they are talking about.