Eric:  You raise a interesting point and promote an optimistic view.  I hope (but am, by no means, convinced) that you are right.

When President Obama was elected we optimists looked forward to a "post-racism" period in our history.....after all, we had elected our first African-American President.  Instead, across the nation racists came out from the shadows and we've seen millions of hard-core racist rants.  In fact there are websites specifically devoted to racist attacks on President Obama.  The boil of racism was lanced and it's still "spewing that rancid river of toxicity".  Many (not all, but clearly many) of the Trump supporters are the very same folks whose racism was "released" by President Obama's election.  

There's nothing to suggest such nastiness will dissipate.  Mr Trump, as these folks' charismatic leader is their hero and the model for their behavior.  If  (when) Ms Clinton is elected  she likely will be the target for continued vitriol from Mr Trump & his followers