The Fallacy bifurcation

Posted on Jun 1, 2011 in Logical Fallacies

This is a subcategory of the Fallacies of Presumptions. It is also known as the “false dilemma” and “the either-or-fallacy”. The fallacy is committed when two propositions are presented as if they were mutually exclusive and the only two possibilities, when in fact they are not. It could be that other options exist or that both are true. For example:“Either you live by faith, or you are a rational thinker”, “I cannot accept the Bible because I believe in science”, “Was the Bible given by inspiration of God (2 Timothy 3:16) or was it written by men (Luke 1:3 and John 21:24)”; both possibilities can be true.

Also this fallacy is committed in the following statement: “Either the earth is old, or God created it with an appearance of age“. The earth is neither old, nor does it “look” old (since age is not something that can be seen). This is a presupposition.

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