Safety from external danger is the most powerful director of national conduct. Even the ardent love of liberty will, after a time, give way to its dictates. The violent destruction of life and property incident to war; the continual effort and alarm attendant on a state of continual danger, will compel nations the most attached to liberty, to resort for repose and security to institutions which have a tendency to destroy their civil and political rights. To be more safe, they, at length, become willing to run the risk of being less free.

 

And Madison in Federalist 51:

Safety from external danger is the most powerful director of national conduct. Even the ardent love of liberty will, after a time, give way to its dictates. The violent destruction of life and property incident to war; the continual effort and alarm attendant on a state of continual danger, will compel nations the most attached to liberty, to resort for repose and security to institutions which have a tendency to destroy their civil and political rights. To be more safe, they, at length, become willing to run the risk of being less free.28