Parade Of Horribles Meaning

Example: A parade featuring a progression of people wearing comic and grotesque costumes.
A rhetorical device employing a series of progressively more terrible results following from an act.
1992, Geoffrey R. Stone, Richard Allen Epstein, Cass R. Sunstein, The Bill of Rights in the Modern State, page 356:
  The majority trotted out a parade of horribles in which judicial line-drawing concerning accommodation would displace legitimate democratic choices.