The worst case scenario of a nuclear reactor going wrong is much worse than any other alternative, however slim the chances of that happening may be. This fact is enough to be concerned about the safety of nuclear reactors.
Cars are the probabilistically one of the most risky form of transport. I doubt that you are concerned about that fact when you get in to one.
Put another way, on average driving 100 million miles is safer than flying 100 million miles (contrary to popular belief that flying is safer than driving).
http://www.pbs.org/wgbh/nova/planecrash/risk-01.html
You can see the fallacy of "cars are dangerous" when you compare cars to motorcycles on that chart, because most people don't ride motorcycles so the probability of death for most people is lower than for a car.
Fukushima is extraordinarily safe for everyone living in Iceland. It is far less safe for everyone living in Japan.