I think one of the problems with most people is they think it won't happen to them, what is to stop the terrorist choosing at random to attack your city/ town and suddenly you are slap bang in the middle of a fatal explosion or worse your loved ones suffer the same tragedy, would it concern you then. I am not trying to sound harsh I just think you need to accept that the current situation is very serious and is coming to a town near you so to speak.
Just about to leave home and go into the city center to do xmas shopping. Should we feel scared? Will a nutter with a knife or gun (God forbid a bomb!) attack innocent shoppers. Millions of people have given their lives over the centuries for the freedom we have today. It will never be taken away by the actions of terrorists.