+1
In big cities like London and Paris, you are at least 2,000 times more likely to die in a travel-related accident than from terrorism. I think if you're going to avoid London due to the infinitesimal risk of a fatal terrorist attack, you'd need to cross off many other places, too, like: New York City; Washington D.C.; Orlando; Boston; Chattanooga; San Bernardino; Columbus, Ohio; Little Rock, Arkansas; and numerous other cities, large and small, in Germany, France, Turkey, Belgium, Canada, Australia, Denmark, Egypt, Israel, China, the Philippines, Malaysia, India... and many others.