They have had a long history of misadministering the lethal injection method, making that “painless death” inconceivably painful. It’s why the medical community refuses to be a part of producing or helping the death penalty machine perform lethal injections anymore.
It’s also why a mechanical “painless death” is being so propagandized now. Those supporting executions will find a way to make criminals suffer with any death penalty. The cruelty is the point, which is unconstitutional.