Depends on who are the victims. If the victims were US citizens I would most certainly take action. I am an American and no American should be treated like that by their own government. I would act, even if it would put my life at risk. If it happened in a different country it would be not my affair. If it happened, lets say France of all places, since I am not French it not my place to dictate what the response of the French people would do. I would hope that they would fight such atrocities as much as possible but ultimately that is the French's problem and not the US's. Now if the French regime invaded the US then we should get involved, wipe out without mercy the French regime who had the audacity to attack us, then come home.