When people are worried about the risk of dying the statistics on doing so are relevant IMHO.
Anyway, as people say, the risk is low, but it would have been much lower in other countries. Also, so what if it's more likely to die of say a car accident? It's the same risk anywhere in the world (kinda to an extent), so that's a risk we're all used to. But for some of us not living in areas of the world where people prefer to kill each other rather than be friends, it's hard to accept any risk of terrorist attacks.