That a demagogue like Trump can get this far is a sad and indeed disturbing commentary on the extent to which America is full of poorly educated, racist and violent hate mongers with no concept of the damage that can be done by the misguided trade and foreign policy approaches Trump proposes, which have been panned by those in the know. But sadly, those same Americans don't read, listen to or understand comments from those in the know, instead getting their information from media sound bites
Build a bunker
It's not sad at all. It might be just what America needs.
He's simply a reaction to the years of losing jobs, false wars, the housing melt-down and the greed of Hillary Street, er, I mean Wall Street, and every CEO who pockets millions while their company's sales tank and their firms lose money, for every hedge fund manager who profits off of the misery of others and politicians who get rich off their "public service. (Hello Clintons).
Trump is essentially a protest vote against the mainstream, professional politicians (Hello Hillary, yet again) who make careers out of being politicians. Sanders is also a protest vote, but a more logical, reasoned and principled one.
Trump is a giant Fuck You to the establishment (even though he IS the establishment) simply because he's not what the system wants and he's unpredictable.
I thought, initially he had a snowball's chance in Hell, but given Crooked Hillary's ways, I'm not so sure.
Even if Trump is elected, the checks and balances will not allow him to become too reckless. Remember, the Republicans obstructed almost everything Obama tried to do. The combined Rep & Dem Senate can do the same to Trump's wackier ideas.
I also think he's pragmatic enough to know when to push, when to feint and when to compromise.