Also, do you mean that it is Ok to kill a prisoner because it is too expensive to keep him alive?
It really is creative activists trying things against the will of the people in those states that support capital punishment. I've got a complicated relationship with the death penalty, but that aside I recognize that the only way to change it is through the institutions we have which are empowered to make those changes.
Corporations are amoral. The activists found a weak point in the death penalty system -- namely, the companies which make the drugs (which is a small market to start with) and are terrified of even the remotest smidgen of public criticism.
(Yes, it's also a miscarriage of justice to wrongly execute the innocent—and to wrongly imprison the innocent, and to fail to execute those guilty of certain crimes)
And how would killing again unstab those 5 and bring them back from the dead?
It would be more theatrical than lethal injection, which I think it part of the reason its avoided. Lethal injection medicalizes the death penalty and makes it seem less like actually killing someone.
"If we as a society want to carry out executions, we should be willing to face the fact that the state is committing a horrendous brutality on our behalf."
[1] http://www.latimes.com/local/lanow/la-na-nn-arizona-executio...
Actually, they should give prisoners the option to self-inflict, via overdose or something.