Oklahoma’s enthusiasm for capital punishment has been a cruel trauma not only for some inmates it has put to death in recent years but also for the state itself. Such is its track record for botched and excruciatingly painful executions using supposedly humane lethal injections — ordeals that have left condemned people writhing and moaning on a gurney, and, in one case, a man saying his body was “on fire” — that the state paused the procedure for nearly seven years, until last year, in an effort to avoid another instance of what many regarded as torture.