Comment: Tormaine, you're right. I don't worry at all about it.  I spend a lot of time in France actually, as well, and have never been afraid to go to a bar or restaurant there either. (Night clubs aren't my thing.)  In fact people who do worry about such possibilities have a particular mental illness in my opinion, since the chances of being killed in a terrorist attack are practically the same as being struck by lightning. 
Relax and enjoy life. You'll kill yourself with worry otherwise.