Somebody did say: But the thing is, nobody put denial ads in newspapers and hunted people down after the Columbine high school shootings. Specifically, I didn't see any apologies from the 'matrix' crowd for providing commonly accepted role models so the shooters would look innocent until acting guilty. I also wonder from time to time why nobody called for air strikes on Buffalo NY after the Oklahoma City attack. I guess somebody thinks that proximity is not sponsorship. We've had bans on travel to Libya in the past, I assume that included immigration from Libya. I think there were attacks in Europe that were attributed to Libya even though the US had banned travel to Libya, but I don't recall attacks in the US being attributed to Libya. One thing that needs to be done is to build things that are resistant to attack. An explosion that penetrates 40 feet into a building shouldn't collapse 12 stories above it. It will be expensive but sometimes things happen by accident, too. Also, maybe a transit system that bans bicycles should limit the carry-on baggage as well. The TV shows these guys as if they're lugging 40 pound packs. It's not complete freedom, but it's a public transit system after all.