So, how do you define "a time of peace"? If it is a time when no one has declared war, Al-Qaeda cleared itself several years ago by declaring war on American civillians. As for deliberately inflicting pain and fear on civilian populations, again the US doesnt get clear by this definition, nor does Israel, Nike, Ford Motors, Turkey, etc. etc. You are closer to the mark when you say all violence is terrorism. The WINNING SIDE become freedom fighters, like those who liberate German and Japanese holdings after world war 2 or the Americans who terrorized the Boston Harbor tea holdings (who would nowadays face stiff jail sentences and a solid tear gassing). The LOSING SIDE become terrorists, and this is a danger some folks on this forum are doing well to remind us; you cant build an army big enough to overthrow Global Corporatization and its government cronies. So if you want to fight, you have to act like a terrorist. The Tibetans who oppose CHina are thus terrorists, the folks who protest the WTO are terrorists, Jesus was a terrorist.
If you wanted to win a war on terrorism you would have to want to win a war on murder and killing. And nobody in power would really want to do that because it would mean improving the quality of life and the political freedom of everyone in the world, through peaceful means only. You catch more flies with honey than vinegar, and believe me, if the US government offered me a cushy job with a nice vacation and full health benefits, I'd stop criticizing it immediately.