Modern nuclear powerplants are much safer than these that had accidents.
Yes you have to include the possibility of new accidents - being sabotaged or not. But that possibility needs to be weighed with the probability of it. And it's very low.
Meanwhile we completely ignore the 100% sure deaths and radiation caused by coal powerplants. Because we're used to it.
BTW sabotaging hydro powerplants can kill hundreds of thousands of people at once. And it's much easier than sabotaging a nuclear powerplant. Get one diver with a swimsuit and give him some TNT.
Somehow I haven't seen this used as a counterargument to renewable energy :)