I'm pretty sure Bush didn't know about incoming attack. Personally, as an observer from distance, I think he cares about USA. But even if not, the attack like that caused him a lot of troubles as a president and politic. Why would he want it? It was or would be, more or less, a political suicside: knowing and doing nothing. I don't believe he knew.
I remeber the day when it happened. I came back from school at 3 PM (9 AM in New York) and my parents were watching TV. My first thought was that it's some kind of catastrophic movie... I was 12 at the time, but I understood it very good: many innocent people died. Not only in WTC towers, not only in planes, but also those who tried to rescue them... Firemen and others... I remember I cried that night. I don't understand people who do such horrible things.
But also I don't understand wars... Well, I'm Polish Roman Catholic. My nation suffered a lot form wars and occupation (I mean communism as well). But I don't know what to think on the topic of war in Iraq. From one side - every war provides suffering and deaths of innocents. From the other side - the Saddam Hussein's regime provided suffering as well. I really don't know what to think of it.
But Tej is right - from what I know Islam is a religion of love and peace. The terrorists are fanatics that misintepret the Quran. And I really don't understand why everybody hates each other. What's interesting: why Buddhists and other religion which are totally different from monoteistic religions can cooperate peacefully with them, and Chrisitans, Jews and Muslims, who believes all in the same one God, can't stand each other? As I said before, I'm Roman Catholic, but it never occured to me to depreciate anyone just because he or she believes in different way! Can we just live and let others live in their way?