In every case of political unrest in a certain country, the police have discovered that some unknown person or persons organized and fomented that unrest. Clearly, ttherefore, behind all the cases of political unrest in that country there has been a single mastermind who organized and fomented them all.
The flawed reasoning in the argument above most closely parallels that in the statement 'Every citizen of Edmonton has a social insurance number, so there must be one number that is the social insurance number for all citizens of Edmonton.'