The core belief of the Establishment is the central state should run everything.
If you're an Establishment insider, the mainstream media will give you plenty of column inches and airtime to label Donald Trump a "dangerous" fascist: for example, Democratic insider Robert Reich's fear-mongering frenzy Donald Trump is a 21st century American fascist, in which Reich conveniently overlooks constitutional limits on any president, "fascist" or not.
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The core belief of the Establishment is the central state should run everything: the state should run the mortgage industry (hey, it does--95% of all mortgages are government-backed or guaranteed); it should run the financial system via setting interest rates, buying bonds and other assets and bailing out/protecting private banks (hey, it does--thank you, Federal Reserve); it should control higher education (the central state not only funds the higher education cartel, it also owns most of the $1.4 trillion in student loan debt); it should control the economy via protecting and enforcing favored monopolies and cartels, and of course the state needs to track any domestic "threats" via surveillance and suppress any resistance to its power by force, media attacks, lawsuits, IRS investigations, social-media smear campaigns, etc.--which is precisely what the U.S. central state's toadies, lackeys, apparatchiks, thugs, bought-off media hacks, et al. do.
That, ladies and gentlemen, is fascism, and that's the Establishment's America. No wonder central-state lackeys like Reich have unleashed frantic attacks against Trump and Sanders--they fear their fascist paradise of central-state-cartel-capitalism might somehow be threatened.
And like all fascists and fascist states, they over-react to any threats to their power. This over-reaction eventually backfires, for it reveals the true nature of their loyalties and their project: that there is an endless need for more state regulations, controls, programs, guarantees and promises that all will be better as long as you cede control of everything that matters to the state. You are of course still "free" to choose your breakfast cereal and which outpost of the Ministry of Propaganda you wish to view/read/listen to.
The carrot dangled by the fascist state is always the same: there is a free lunch for everyone who cedes control over their lives to the state. For corporations, the free lunch is a quasi-monopoly; for debt-serfs, new programs that erase their debts (i.e. transfer them to others), and for everyone, more entitlements, up to the Nirvana of the fascist state, Guaranteed Minimum Income for all.
The tragic irony is, as we all know, there is no free lunch. The central state generates the illusion there is a free lunch to institutionalize the dominance of the wealthy and powerful and institutionalize serfdom for everyone else.