The establishment consists of both democrats and republicans. These establishment politicians are more alike than they are different. They pretend to be diametrically opposed to each other each election cycle in front of the public, but behind closed doors, they are essentially the same party. Donald Trump and Bernie Sanders are not establishment, and this sends fear to the establishment. There is a difference between policy regarding the public, and policy among themselves, as the elite. It is elites versus the public. Democracy and transparency is just an illusion that the voter has to a certain extent. Just like how far left and far right form their own echo chambers and herd think, so it can happen across party lines. Democrat and republican is just a label. What gives a distinction is the fundamentals, and fundamentally, elites form a consensus, and follow it.