From Human Action — surrounding passage

The source of present-day German aggressiveness is the very fact that the Germans have discarded liberal philosophy and substituted the ideology of nationalism and socialism for the liberal principles of free trade and peace. If mankind does not return to the ideas today disparaged as “orthodox,” “Manchester philosophy,” and “laissez faire,” the only method to prevent a new aggression is to render the Germans innocuous by depriving them of the means of waging war.

“Man has only one tool to fight error: reason.”

3. Might Society is a product of human action. Human action is directed by ideologies. Thus society and any concrete order of social affairs are an outcome of ideologies; ideologies are not, as Marxism asserts, a product of a certain state of social affairs. To be sure, human thoughts and ideas are not the achievement of isolated individuals. Thinking too succeeds only through the cooperation of the thinkers.