A Republic runs by the Rule of Law. It is equal for all and if people don’t like it, they go through the process of changing the law.
An Oligarchy runs by the Rule of Men. They make their choices, they make selective decisions about who will benefit and who will be punished. And if people don’t like it they can go pound sand.
There is virtually never an honest effort to even discuss the underlying causation for what they seek to attack.
For further development, War On An American Future.
To find a recognizable analogy, think about the methodology of the concert hall magician. The Left since the Jacobins in France has always relied on illusions.