The slippery slope is a logical fallacy that suggests taking a minor action will inevitably lead to a chain of related events culminating in some significant (usually negative) event, without providing any evidence or reasoning that this progression is likely to happen.
It involves an appeal to fear by hinting that one step in a certain direction will automatically lead to undesirable consequences, eventually ending in some worst-case scenario. This type of reasoning often lacks proof that these consequential events are causally linked, thereby making it a fallacy.
Consider the following argument: “If we allow students to retake failed examinations, they will get complacent. Then they will start failing on purpose to get a second chance. Eventually, our education system will be filled with lazy and unqualified individuals.”
In this example, allowing students to retake failed examinations is seen as the initial minor action. However, the argument quickly spirals into a series of more severe consequences (students becoming complacent, failing on purpose, and ultimately leading to an ineffective education system), without providing evidence that these events are likely, or even causally connected.
The complacency of students is not an automatic consequence of allowing retakes, nor does it necessarily lead to intentional failure or an ineffective education system. By oversimplifying and predicting extreme outcomes, this argument falls into the slippery slope fallacy.