I think the assertions here are overblown. The social fabric of American society isn't dissolving. The women's marches are proof that millions of Americans share core democratic values and they're willing to hit the streets to defend them. What is more, these values are shared outside the United States as the millions who marched in protest of the fascist Trump demonstrate. Where the social fabric is dissolving is between the Americans who value and defend democracy--women's rights, the rights of people of color, voting rights, etc. and those who do not. 
A look at how the voting for Trump and Clinton breaks down shows where the social fabric is dissolving. Urban America is diverse and likes their diverse, prosperous way of life. Rural America is white, angry and has some serious problems with drug abuse. Trump support is strongest where the drug epidemic is the worst.