'Inciting civil war' is probably over-egging it a bit (civil war - an odd phrase, to my mind; there's no war more impolite than a civil one!). Certainly, though to an outsider, it is very striking that not only is the "centre" of US politics probably the furthest to the right of any country on Earth, it's also astonishingly polarised. There doesn't seem to be any common ground on anything, and no willingness to meet in the middle or compromise at all. As for Trump, the world's best hope is one of his regular fits of apoplexy will give him a heart attack at least serious enough to incapacitate him. Mean thought though that is...