1.Why do they attack us? This may be answered by reading further

1. OBAMA:"It is clear that al Qaeda increasingly seeks to recruit individuals without known terrorist affiliations ... to do their bidding. ... And that's why we must communicate clearly to Muslims around the world that al Qaeda offers nothing except a bankrupt vision of misery and death ... while the United States stands with those who seek justice and progress. ... That's the vision that is far more powerful than the hatred of these violent extremists."

BRENNAN:Al Qaeda is an organization that is dedicated to murder and wanton slaughter of innocents. What they have done over the past decade and a half, two decades, is to attract individuals like Mr. Abdulmutallab and use them for these types of attacks. He was motivated by a sense of religious sort of drive. Unfortunately, al Qaeda has perverted Islam, and has corrupted the concept of Islam, so that he's able to attract these individuals. But al Qaeda has the agenda of destruction and death.

3.She was dissatisfied with Brennan’s answer because it was an answer that did not tell her what she wanted to know.

I don’t think she would have been much happier with Obama’s answer because they were almost the same answer, just worded differently