Debate Guide: It's wrong because it's illegal

Appeal to authority

Adult-minor sex is wrong, period. Because it's illegal/outlawed in most societies.

Nothing is wrong just because it's illegal. Law is a flexible system of moral judgments, which vary according to the place on earth and the time in history. Laws, being written before the act and involving nothing more than subjective judgments, have no ethical authority over the rightness of any practice. One example that demonstrates this is miscegnation, but lets instead cover gay sex:

According to your very basic legalistic morality, gay sex has gone from being 'wrong' to 'more/totally acceptable' in a number of recent societies, as the laws changed and were eventually equalized. Gay sex would also be wrong in some present societies that outlaw it, but not elsewhere! If the circular reasoning of "illegal = wrong = illegal" was a vaild argument, all forms of deregulation would automatically be immoral and irresponsible. There would be no acceptable reason for the legalization of any human behavior; i.e. we would all be living in an authoritarian dictatorship by the time a few governments had been given the chance to outlaw their freedoms and vices of choice.

Fallacies and cognitive distortions covered

See also, our dedicated article:

• Appeal to authority.
• Circulus in probando fallacy: The reasoning behind this argument is a fallacious circular ("We know it is wrong because it was made illegal because it's wrong").
• Cognitive distortion: Musturbation.

See also

Wikipedia:

• Is–ought problem - Proponents of this argument may also show a general inability to distinguish is from ought statements.