If you looked into the world back then - there was great revolting against establishment too - no matter the ideology (or actions) in any country during the great depression - they were exchanged for someone else.
The ruling class has 2 responsibilities - economic growth and redistribution and security. They must keep reasonably safe and deliver enough to the people to not starve.[1]
The post 9/11 media frenzy made people feeling permanently insecure - this is something no government can win now. The US now has 2 economies that are lumped together for statistical purposes. The one of them is doing just fine. But its recovery masks the plight of the great unwashed that all the rest of us are.
The people feel the desire to burn the system. Nothing strange with that. Anyway - if the presidential election is Bernie vs Not Trump or Hilary vs Trump - you can completely write off the establishment candidate. Since the voters behind Bernie and Trump seems to hate the current order more than they are loyal to their own party.
The bullying against BS supporters to vote for Hilary in case of her winning the nomination is telling.
[1] Safety and not starving have different meanings depending on society, culture and past experience.