The great lesson from history that each consecutive generation seems to forget is that the tools of tyranny used outward will inevitably be turned inward. That is to say, the laws and weapons governments devise for supposed enemies abroad will ALWAYS and eventually be used against the people they are mandated to protect. There is no centralized system so trustworthy, no political establishment so free of corruption that the blind faith of the citizenry is warranted. If free people do not remain vigilant they will be made slaves by their own leadership. This is the rule, not the exception, and it applies to America as much as any other society.