I was in Paris a little while ago and people were saying that Americans were canceling because of fear of terrorism because of the recent attacks. That just shows that Americans can't do math, because they have far higher odds of getting in a fatal car accident on vacation then being victims of terrorism. The probability of being a victim of terrorism in France is truly negligible.
I agree with your sentiment but this is hardly limited to Americans - I've read and heard many Europeans discuss avoiding American all together due to the perceived risk of gang shootings, mass shootings, terrorism, and run in's with the TSA. I suspect that a small percentage of travellers modify their plans due to poor risk assessment skills but there are many reasons tourism may be down in some areas.
