Another civil war probably isn't likely, but he's right that most of the ingredients are there. The one that worries me the most (other than the incredible glut of firearms in this country) is the growing distrust in media. Especially when political leaders and contenders for office reinforce this distrust with every other sentence. Once upon a time, journalism was an honorable profession, and it was seen as such. What if no one had paid attention to Woodward and Bernstein? Would Watergate have been brushed under the rug as a "liberal media lie?" What if the muckrakers had been derided as mere sensationalists and their exposes of business and political corruption, to say nothing of "The Jungle," (which still grosses me out) went unread?
When you feel you can't trust anyone, the only people you can trust are the ones telling you exactly what you want to hear, what you already believe. When all the people have their own version of truth, truth ceases to exist--no one knows how or where to look for it. The end result will be a population in which most people stop caring. You can hear it already when people talk about politicians--"They're all the same, crooks and liars." Apathy is the enemy of democracy, because the only people who care enough to vote are extremists who support equally extremist candidates. And when all the politicians stand at opposite ends of each issue and refuse to take a single step toward the middle, nothing gets done. Well, nothing good, anyway.
This is how civil wars start--neither side giving an inch, with fanatics on both sides screaming that something must be done. And we're a lot closer to that place than I'm personally comfortable with. I still don't expect war, but something wicked this way comes if all this rage and hatred doesn't simmer down--soon.