People aren't scared of dying in traffic or by a preventable medical error. Maybe they should, but they aren't. Those risks are real, but they don't affect how people go about their lives. Terrorism is a tiny risk of death but an enormous cost in terms of percieved safety.

Its a cliché to say "defend our way of life", but throwing money at creating the illusion of safety so I dare go to the football stadium is just that. I wish we didn't have to spend millions securing a football match, but one can't dismiss it as a waste without assigning a zero value to the idea of going to watch the match. Times many thousand spectators.