The logical fallacy of the package deal consists of assuming that things often grouped together by tradition or culture must always be grouped that way.
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." (Usually the connection is made much more implicitly.) While those positions are often grouped together as "conservative" in American politics, there's really no reason someone couldn't approve of some but not others.
The package deal fallacy refers to misuse of the andoperator. For misuse of the or operator, see false dilemma.
A logical fallacy is an error of argument ; it is a mistake in the way that the propositions (in the argument) are inter-related.
In the opposite direction is the fallacy of argument from authority.
By definition, logical fallacies are invalid, but they can often be written or rewritten so that they follow a valid argument form ; and in that case, the challenge is to discover the false premise, which makes the argument unsound.
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