Fallacy of necessity:

Definition Example
a degree of unwarranted necessity is placed in the conclusion based on the necessity of one or more of its premises. I’m a bachelor, and being a bachelor is necessarily being unmarried, therefore I can never marry since I need to be single.
  Notes
Something may be logically necessary due to a definition, but this necessity does not carry over into the actual world in which one can choose to change their marital status.

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