The Post Hoc Fallacy
In philosophy, a fallacy is a logical breach, or fault, in an argument. A fallacy is an argument which appears to be correct but contains at least one error and, as a consequence, produces a final conclusion or statement which is clearly wrong.
In terms of "Post hoc ergo propter hoc" means 'after this, therefore because of this. This is a type of belief that may be widespread in a community but still happens to be wrong.
The Post Hoc fallacy lies in coming to a conclusion based solely on the order of events, rather than taking into account other factors that might rule out the connection. The assumption is that "since that event followed this one, that event must have been caused by this one."