I disagree with Keith about publicity. I am just planning a business trip to a country where the security situation is roughly like that of London during the 1970's - if using the rail or tube you didn't hang around in the stations. So I am watching the news to see if the "not if but when" attack happens.

That's what terrorists want all visitors and locals to do. It has been called 'anticipatory dread'. I did pay attention in my statistics classes though.