Because freedom can't protect itself
If someone is incapable of being executed because they lack intellectual capacity, saying it would have to be proven that it was an impediment to their defense is placing the defendant’s intelligence on trial and not their crime. More to the point, their disability does not deprive them of the right to counsel. And speculation as to whether said counsel has the intellectual capacity to represent those who do not possess such faculties as they themselves possess is not due process and does not warrant scrutiny by the suspected deficiencies of their clients after a conviction. Such mishaps in due process have a legal venue to be determined in. The degrees or gradients of intellectual capacity cannot be quantified to such an extent as to be used in discovery, rendering a verdict based on the defendant’s intelligence impractical.
More to the point, if it is considered humane to sentence the mentally deficient to a life sentence as opposed to a death sentence because somehow their mental capacity warrants such, then this hopefully implies that they at least have a preference of life over death. If this is the case, then the weight of their offense should be evident to them, if not, then they are either incapable of applying this understanding of the preference of life and welfare towards others in which case they are likely unable to appreciate the gravity of a life sentence or they are capable in which case they were aware that their crime was an obtuse disregard of another’s preference to life and welfare which leaves them able to appreciate the magnitude of a death sentence. Since the death sentence is applied to those who are deemed beyond redemption one cannot logically expect sanctuary from the death penalty simply because they are incapable of understanding what they did was wrong. A run away criminal is no less heinous then a caloused one.
It's nice the Ohio Governor commuted the sentence to life in prison, but I think to describe that as "the only just and humane thing to do" is a bit of a stretch.
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