That would increase total suffering, as people condemned to be executed will under go a great deal of suffering.

The "by any means necessary" method...? I think a society based around the normalization of this level of punishment is distopian. Achieving the lowest opiate addiction rate possible may not be worth it given the probability of wrongful incarceration/death, its optimising the wrong thing. I think humanity should just accept the multi-facetedness of the universe and work on systems which work without compromising our humanity. We are hooked on mental shortcuts and quick fixes.

Also ban the chewing gum while at it (as they do there).

The murder rate of the USA is now almost 3 times higher than that of El Salvadors.

New Zealand now has more murder than El Salvador.