Pretending that there's a compromise just floating out there that if we could just get "the extremes" out of the way, would be embraced by all, is a rosy but ultimately utterly false fantasy.
There are very, very different views about the role of government and religion in this country, very different takes on morality, responsibility, and lots more. These are not resolvable via compromise. If things are relatively good economically, people can generally agree to disagree. When things are not so good financially (e.g. after 30+ years of the destruction of the American manufacturing sector and wholesale movement of capital and labor offshore), this becomes much, much less easy.
The answer to "Can't we all just get along" is, fundamentally, "No, unless we're all doing so well that we don't have to care".