Because he didn't want us to have to go to war with the entire Islamic world. He was about to send troops into Muslim nations in order to go after terrorists and didn't want them all shot on sight. What would you have done and how many American lives would YOU have sacrificed in order to please a couple dozen armchair generals?
Would you at least wipe the froth off of your mouth, stop, and think for even a nano-second?
The WTC came crashing down after Arabs hijacked and flew American planes into it, killing thousands of Americans. Same thing happened to the Pentagon, but with less casualties.
Americans' passions and shock were overwhelming. Never since the 1860s had this country seen anything remotely close to that on our soil.
With Americans' blood boiling hot enough to melt steel, the President wasn't about to go and make a statement on national TV disparaging Arabs and/or Islam for the sake of those Arabs and Muslims in AMERICA! Had he made a statement like you would have wanted, even more blood would have been shed in our streets. Enough innocent blood had been spilled by those barbarians.
The President of the United States of America does NOT need to lead a mob mentality, or make a statement(s) that would be construed in such a way.
Your line of thinking would have reduced us to the level of those barbarians who attacked us! We are AMERICANS. We are better than that.