The execution of the mentally ill should end

There is an interesting report by Amnesty International advocating the end of capital punishment for the seriously mentally ill. Whatever one's perspective on the death penalty--I consider it barbaric in all situations--the execution of those who do not have the mental capacity to aid in their own defense or even understand the seriousness of what is happening to them should stop. Often they will end their own appeals with no idea that it will lead to their death. The Amnesty report ends:

For the USA to be pursuing this premeditated ritualistic killing in the 21st century against offenders suffering from serious mental illness is particularly offensive to widely held standards of decency.