On the other hand, now that we've had a few terrorist incidents where vehicles were used to plow through groups of pedestrians, there is kind of a perverse inte

On the other hand, now that we've had a few terrorist incidents where vehicles were used to plow through groups of pedestrians, there is kind of a perverse intersection of these two issues. Also, there has been a proliferation of bollards in areas where such attacks are considered a risk. Lastly, your point about the psychology of risk is well taken. I can't remember where I saw (perhaps it was a comedian?) the lament that climate change doesn't have a beard and turban.