The logical fallacy of the package deal (also known as false conjunction) consists of assuming that things often grouped together by tradition or culture must always be grouped that way.
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It is particularly common in political arguments: "My opponent is a conservative who voted against higher taxes and welfare, therefore he will also oppose gun control and abortion." While those four positions are often grouped together as "conservative" in American politics, there is no reason that one cannot believe in one "conservative" idea while not believing in another.
The package deal fallacy refers to misuse of the and operator. For misuse of the or operator, see false dilemma.
Additional examples
When it is not a fallacy
The package-deal argument need not be a fallacy when used to argue that things grouped by culture and tradition are likely to be grouped in a given way.