I'm really not sure. Until I've been touched by such an event, I really don't know. Maybe precognitive killing is okay? Like how Light killed the guy outside the store because he was harassing, and seemed like he was going to continue harassing, a woman.
I think, to an extent, it can be justified, and, while it is said we shouldn't get the coice to end someone's life or not, the murderers who Light kills are taking that power into their own hands. So maybe the power should be used against them?
All crime is bad, in one sense of the word, and, while there should be punishment, death maybe isn't a legitimate answer?
I'm not going to vote, as I really don't know. If there was a "I'm not sure" box, my vote would be there.