Please briefly summarize this news article:

What Is With Those Crowds at Trump Rallies?

Nell Irvin Painter, author, "The History of White People"

Throughout history, a challenge to the status quo of white-people-on-top has been met with vile weapons, both rhetorical and physical.

Stephanie Coontz, Council on Contemporary Families

How many of us, watching the disappearance of gains we worked for, are saintly enough to put aside our anger because others have it worse?

Robert P. Jones, Author, "The End of White Christian America"

The apocalyptic rhetoric is fueled by energies that are unleashed when a long-dominant group senses the looming end of its era.

Sarah Sobieraj, Co-author, "The Outrage Industry"

Conservative talk radio and cable news has offered validation for years, but Trump offers it up as mainstream fare for the primetime audience.

Caroline Heldman, Author, "Rethinking Madame President"

Trump’s caricatured performance of masculinity soothes fearful Americans who feel they are being culturally left behind.

Summary:

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Where is this nastiness coming from? Has Trump released their inner demons or are they merely unbound by fear of political correctness?