Recent history, Where have terrorists been most successful, embassies, pentagon, attempt at the white house, etc.....
Do doubt blowing up a shopping mall would be devastating. I am almost surprised it hasn't happened...
No recent history tells us that civilian targets have sustained the largest number of deaths in a terrorist attack. Not to mention the economic impact. What happened to the WTC, filled with many thousands of civilians, was far worse than any other attack, anywhere. I feel the Federal government should be just as concerned about security of civilians as much as they are for their own facilities. With millions of unidentified people entering this country illegally, on a regular basis, they are clearly not.