Said more clearly, declaring Crocker's Rules informs everyone else that they need not fear offending you if they wish to share controversial opinions. E.g. an

Said more clearly, declaring Crocker's Rules informs everyone else that they need not fear offending you if they wish to share controversial opinions. E.g. an elderly person may declare Crocker's Rules during a discussion on the utility vs. cost of the elderly in society, such that younger people feel comfortable speaking openly against Medicare, etc.