I don't know for sure but the general problem is that while certainty is almost nearly more effective it's also way less enforceable, meaning, it's much more di

I don't know for sure but the general problem is that while certainty is almost nearly more effective it's also way less enforceable, meaning, it's much more difficult to enact laws that create more certainty of punishment: https://en.wikipedia.org/wiki/Deterrence_(penology)#Certainty_vs._severity https://en.wikipedia.org/wiki/Deterrence_(penology)#Certaint...