No one (of any import) is asking American Arabs and Muslims to apologize for terrorism. Most Americans are very anxious to hear you repudiate it though.
The United States has lost 3,000 souls to terrorist thugs, but that figure is miniscule compared to the 60,000 Algerians or the 25,000 Iraqis who also have died at their hands. These thugs don't differentiate between Muslim and non-Muslim, Arab and non-Arab when they plant a bomb or enter a village at night and murder everyone.
That kind of, almost, sounds like a repudiation of terrorism. It's as close as you got anyway.
It is rejection of U.S. and British policies in the Middle East, not Islam, that has promoted terrorism against America. And for the benefits of those who do not know, 95 percent of Middle Easterners are Muslims.
Whatever lip-service you paid to sentiments of repudiation disappear like the morning dew in Arizona when you make excuses for fanatics who kill men, women and children at random.