I guess a more analogous phenomena would be sudden death due to various medical conditions. Just to pick a random one (not the only one): spontaneous coronary artery dissection.
Statistics are rather difficult to come by on this, but assuming the US population incidence is 0.28% [0] of all 735,000 'heart attacks' per year in the US [1], with a mortality rate of 60% (wikipedia says 70% but that number is iffy), that's 1235 random "sudden deaths" per year from just one non-preventable and non-predictable medical condition alone.
So I suspect the more general point, that statistically you are much more likely to be randomly killed by "not terrorism", is probably a valid one.