Hmm, you and I are pretty much on the same page. I see no evidence that those Stanford students, who were technically adults, possessed many of the positive character traits I listed. When empowered and protected from negative consequences for negative behavior, the majority chose the negative behavior freely and of their own will. Oddly, a few were able to resist-- such as the graduate student who called Zimbardo on the bad ethics of the situation and demanded that the experiment be stopped.
There are plenty of real-life corrections officers who are definitely in the position to do similar things as the Stanford students, who refrain from it. Even in the events leading up to the notorious Santa Fe Prison Riot, there were individuals among the prison staff who were protected by the rioting inmates simply because they did not abuse what power they had, and because they treated the inmates with dignity and basic respect despite massive opportunity to not do so.
I sometimes wonder if any follow-up studies were done to find out whether any of those Stanford students playing the role of guards, who gave in to their more sadistic tendencies, later "broke bad" or snapped in a way that "couldn't have been predicted".