This fallacy claims a minor first step will inevitably cause a drastic conclusion, such as arguing that skipping a single class will ultimately lead to being homeless.

During the Cold War, the US government famously used the "domino theory" to argue that if one nation fell to communism, neighboring countries would inevitably follow.

Logicians reject these arguments because they assume the worst-case scenario will happen without proving the likelihood of each specific intermediate event occurring.

The key flaw is the assumption of inevitability. In reality, humans can establish legal or social stopping points to prevent a minor policy change from becoming a disaster.