Logic Bomb

A phrase, or verbal tactical argument that is sufficiently devastating in its logic to blatantly show the inherent irrationality of an idea, a policy, a social norm, or an institution, and therefore to destroy it.

(There is of course, sadly, the potentially long interim period between when a social norm or institution is destroyed logically and when it ends in actuality.)
Slavery: search the writings of Frederick Douglass
Dueling: see Robert Axelrod's Complexity of Cooperation

Example of a Logic Bomb for the death penalty:

Because inherently some few innocent people are executed every year, those that support the death penalty, particularly those judges, etc. that willingly participate in carrying it out, are at the very least serial accomplices in murder (and because it is willful and premeditated, they are likely 1st degree offenders). Because of the high number of such cases (not to mention the particular cruelty and callousness involved, let alone the serial nature of their crimes) they are eligible for the death penalty, and should be placed under arrest immediately.
by Belief Show September 25, 2011
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