- When an argument implicitly assumes that a specific member (or subset of specific members) of a wider class is the wider class. Similar to Fallacy Of Composition in transferring one thing's properties to everything else in its class, and overlaps at times with False Dichotomy (which occurs when two members of a wider class are claimed to be the only members of the wider class and that a choice must be made between them). This fallacy is often caused by an unstated premise.
"An Egoist theory of ethics is a contradiction in terms".
- This assumes that "ethics" is a synonym for "non-self-interested."
"Anarchism is not a political ideology because politics is about the role of the State; advocacy of a stateless society is not a political position."
- This assumes that the only valid political ideologies are those that endorse the existence of the State.
Looks like this fallacy, but is not: