Boatman I disagree,
All other political, teaching, scientific, moral, and philosophical systems acknowledged history as a foundation to learn and adapt from. They acknowledge man is flawed and try to be better through various systems of morality. The Frankfurt School is rooted in erasing history and human nature to build a new Utopian socialist state. All of the socialist and communist literature focuses on a clean break and erasure of the past including rewriting human nature. There is no morality, because man is to be perfect, his nature changed as to make morality unnecessary. There is a massive suspension of disbelief inherent in the system where it denies human nature. It claims to be humanist in easing suffering and unfairness, when it actually is the most inhuman system indifferent to the suffering of an individual possible.
All other systems acknowledge human nature by looking at history and trying to find solutions within a flawed existence. The enlightenment of the 17th and 18th centuries was the result of true intellectuals reevaluating the writings and history of antiquity in pursuit of improving the current state of civilization which they knew was flawed. They learn from mistakes and experiments. Socialism doesn't, it destroys and keeps destroying because it's impossible to destroy human nature. Any history written, even by socialists, is constantly revised and destroyed because knowing a history which demonstrates socialism doesn't work and that human nature can't be changed is antithetical to the exercise. Socialist societies can't learn from their mistakes because remembering failure is not allowed.
Sorry if I was not clear, I was not discussing socialism, I was responding to the line in the OP's statement, "America is under attack means our liberty, our freedom, our rights, are under attack. This time isn't like any before. This time they are all in".
I believe this statement could have been made anytime in the past 250 years regarding issues that were extremely divisive.