Passage Summary: Because every specific riot was started by someone, the author assumes one person must be behind every single riot that has ever happened.

Conclusion: A single individual is responsible for every instance of political unrest in the country.

Reasoning: In every individual instance of unrest, the police found that someone had organized it.

Analysis: This is a 'quantifier shift' error, often called the 'birthday fallacy.' Just because every person has a mother doesn't mean there is one woman who is the mother of every person. The premise establishes that for each event (A), there is an organizer (B). The conclusion incorrectly leaps to the idea that there is one organizer (B) for all events (A). To find the parallel, look for an argument that moves from 'each thing has its own cause' to 'one thing caused everything.' It's a classic case of over-centralizing responsibility where multiple independent actors are more likely.