A declamation written, or more often oral, where emotionality supersedes rationality. Its purpose is a call to action, often identifying a target for ire and a path to resolution. Due to the pejorative connotation of the term it is a descriptor that is often subjective, most often applied to messages disagreed with.
pompous or pretentious talk or writing
bombastic declamation
talk in a noisy, excited, or declamatory manner
a loud bombastic declamation expressed with strong emotion