Slippery slope

A slippery slope fallacy (SSF), in logic, critical thinking, political rhetoric, and caselaw, is a fallacious argument in which a party asserts that a relatively small first step leads to a chain of related events culminating in some significant (usually negative) effect. The core of the slippery slope argument is that a specific decision under debate is likely to result in unintended consequences. The strength of such an argument depends on whether the small step really is likely to lead to the effect. This is quantified in terms of what is known as the warrant (in this case, a demonstration of the process that leads to the significant effect). This type of argument is sometimes used as a form of fearmongering in which the probable consequences of a given action are exaggerated in an attempt to scare the audience. The fallacious sense of "slippery slope" is often used synonymously with continuum fallacy, in that it ignores the possibility of middle ground and assumes a discrete transition from category A to category B. In this sense, it constitutes an informal fallacy. Other idioms for the slippery slope fallacy are the thin end/edge of the wedge, the camel's nose in the tent, or If You Give a Mouse a Cookie. Some writers distinguish between a slippery slope event and a slippery slope argument. A slippery slope event can be represented by a series of conditional statements, namely: if p then q; if q then r; if r then ... z. The idea being that through a series of intermediate steps p will imply z. Some writers point out that strict necessity isn't required and it can still be characterized as a slippery slope if at each stage the next step is plausible. This is important for with strict implication p will imply z but if at each step the probability is say 90% then the more steps there are the less likely it becomes that p will cause z. A slippery slope argument is typically a negative argument where there is an attempt to discourage someone from taking a course of action because if they do it will lead to some unacceptable conclusion.

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Related concepts (3)

Slippery slope

Logic

Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or logical truths. It studies how conclusions follow from premises due to the structure of arguments alone, independent of their topic and content. Informal logic is associated with informal fallacies, critical thinking, and argumentation theory. It examines arguments expressed in natural language while formal logic uses formal language.

False dilemma

A false dilemma, also referred to as false dichotomy or false binary, is an informal fallacy based on a premise that erroneously limits what options are available. The source of the fallacy lies not in an invalid form of inference but in a false premise. This premise has the form of a disjunctive claim: it asserts that one among a number of alternatives must be true. This disjunction is problematic because it oversimplifies the choice by excluding viable alternatives, presenting the viewer with only two absolute choices when in fact, there could be many.