I am sure they would have no regrets about blowing up one of their remaining targets from September 11.
If that's what it takes to wake people up---and if nobody gets hurt---it's a small price to pay. Priceless heirlooms and monumental architecture passeth away, I have reason to know. Might as well passeth away for a good purpose, like raising American wrath against America's mortal enemies.
Praise the Lord and pay the insurance premiums on time.