[drail]

1) If deterrance is the only reason you support the death penalty, and there is proof it doesn't do that then even a 0% error rate would not meet the standard. Only other criteria would make it worth it like closure for the families etc.

2)To the question of how many innocents to die in order to save other innocents i think at least one more person should be saved than sacrificed or your more or less just saying that the group you saved is in some way better than those you sacrifice.