Single cause fallacy:

Causal/Conceptual Fallacy

Definition	Example
When it is assumed that there is merely one cause of a phenomenon, while other possibly contributing causes go undetected, are ignored or are illegitimately minimized.	The recent drop in crime in our neighborhood is due to better policing.
Also known as: joint effect / causal oversimplification / causal reductionism
Notes
The actual cause of a local drop in the crime rate may actually be a collection of causes such as the installation of surveillance cameras, a better local economy that has given would-be criminals jobs and money, improved forensics, new home entertainment hardware and software that keep would-be criminals preoccupied, better role models, and tougher laws that have locked up the most frequent offenders. This fallacy is a type of false dilemma.

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Case Study One

Nearly every country that has become prosperous throughout history has had a significant percentage of its citizens claiming that their greatness was entirely due to the superiority of their nationality or their particular god.

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Case Study Two

Whenever there is a school shooting, there emerge dozens of speculative opinions, many indexing a single cause such as poor parenting, violent video games, secular education, or the availability of guns. A responsible opinion would attempt cite evidence for the weight of each possible cause.

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^{Keep in mind that a fallacious argument does not entail an erroneous position.}

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