Then that decision should be made in public by the elected representatives or by referendum in accordance with the state's laws, not by a tiny group of activists making it practically impossible via backdoor methods.
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.