July 8, 2010
Affirming the consequent

Logical fallacy of the day - Affirming the consequent.

Affirming the consequent is a formal fallacy of reasoning that works backwards from an outcome to establish a cause, despite the flow of cause and effect.  It is a three-step argument.

1. If P, then Q.
2. Q.
3. Therefore, P.

Senator Conroy uses this often, and it’s parodied well at http://conroylogic.com/, which takes a nonsensical statement and uses it to accuse you of hating children, if you don’t want to protect them (with a filter).

1. Child pornographers would not want an internet filter.
2. You do not want an internet filter.
3. Therefore, you must be a child pornographer.

This ignores the virtual plethora of reasons a sound, rational person would not want the government controlling its access to information.  Conroy indirectly levelled this accusation at Kate Lundy for her proposed “opt-out” amendments to the filter.

“We have got an election commitment to deliver,” he said. When asked about his personal views of the proposed amentments, Conroy said: “I’m not into opting in to child porn.”[1]

  1. ccake reblogged this from noisybenign and added:
    I once had a uni lecturer, while explaining this concept declare A CHICKEN HAS TWO LEGS I HAVE TWO LEGS THEREFOR I AM A...
  2. noisybenign reblogged this from nhac and added:
    Aaaaand a little backstory, for all you nerds who love logic gates: http://en.wikipedia.org/wiki/Material_conditional
  3. nhac reblogged this from stephenconroyisanidiot
  4. stephenconroyisanidiot posted this