What is van den Haag's position about statistical evidence for the deterrent effect of the death penalty?

Question

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Van den Haag is skeptical that statistics could provide evidence one way or the other about the deterrent effect of the death penalty. He argues that statistical studies cannot definitively prove or disprove the deterrent effect, because they cannot control for all confounding variables and the motivations behind criminal behavior.

What Is Van Den Haag's Position About Statistical Evidence for the Deterrent