The British seem to have developed a dark sense of humour over being bombed and such for quite a while (I remember all sorts of bomb scares and actual bombs when I was a child, and was evacuated from buildings so often it became routine), and I think I have that coping mechanism ingrained.
I remember after the bombings in London a few years ago, I heard the first joke within 2 hours of the event, and it was "Boy, the French must be really pissed about not getting the Olympics". I lauged, even though my mother and brother were in London, commuting at the time of the bombings. Heck, my brother probably made a very similar joke.
Let us laugh, and love, and not sit paralyzed with fear and second-guessing. Life is to be lived.