You would think that, but it turns out that isn't the case. [0][1]
[0] - https://www.dartmouth.edu/~chance/teaching_aids/books_articl... [1] - http://www.deathpenaltyinfo.org/deterrence-states-without-de...
You would think that, but it turns out that isn't the case. [0][1]
[0] - https://www.dartmouth.edu/~chance/teaching_aids/books_articl... [1] - http://www.deathpenaltyinfo.org/deterrence-states-without-de...
In any case: you can't reasonably make inferences about the effectiveness of the death penalty simply by counting murders in states that do or don't have it, since there are so many other factors influencing how many murders a state will record.
You're right, it is hard to draw any conclusions about the effectiveness by looking at murder numbers alone. It seems most experts would argue against deterrence being effective though and I would agree. If you can't say for certain whether or not something such as the death penalty is effective, then I think it is best to error on the side of not killing people.