Of course, public policy on any punishment cannot wait until the evidence is perfect. But, even with the limited quantitative evidence available, there are good reasons to believe that capital punishment deters.
当然，有关任何处罚的公共政策不应当等到证据完美无缺时才予以确定。但是，即使根据现有有限数量上的证据，还是有充足的理由相信死刑具有震慑力量。