The only reason this didn’t happen at the RNC is because Trump’s support was so large and vocal. Had it been any closer,the party would have skewed the convention in the same manner. Most regular RNC delegates, with the exception of Dr. Paul’s supporters, are very much conformists. They would have gone along with whatever came down off the mountain from committee.
The Trump delegation, despite being infiltrated with party hacks at every turn, was a completely different animal. The groundswell of popular support for Trump (or at least his outsider status) is unprecedented since Reagan at least. There was no way to control the narrative and the party insiders lost.
Preibus understood this before the others. I still don’t trust him, but his own self-interest and hope to save the party motivated him to switch sides. Those who remain never-trumpers are selfish cowards who fear the constituents for good reason.
I believe the Democrats were seriously unprepared for the success of an openly socialist/communist candidate. Bernie was supposed to play Dr. Paul— the kindly crazy uncle whose “extremism” channels dissent and ensures no mainstream support. I think the Democrats underestimated the success of their educational efforts—we now have 45% of a Democrat generation that sees no problem openly supporting communism, and I think that number is a gross underestimate.
While that remains a smaller segment of the population as a whole, that number translates very close to 20% of the politically active—around the same number who supported a radical named Washington.