I rarely post (although I read every article), but I felt that I have something to contribute, so here goes:
My dad was in prison for just over seven years, for the most part of his twenties. He was incarcerated for grand theft auto, and trying to slip draft during the Vietnam War by taking the stolen car across the border to mexico (stupid, stupid, stupid). From some of the things he has told me, I got the impression that being in prison is probably one of the worst places in the world to be. Somewhere to avoid being, at all costs.
I am sharing this because when I read this slide, I immediately realised that while these experiments are interesting and have an interesting outcome and value, they are intrinsically biased and are not a true representation of prison life. I know this because some of my dad's stories involved the drug life in prison and just how many loonies there were. The fact that these two groups were excluded from this test skews the results in a way that is unforseeable.
Realising both that this was just a simulation and that the 'wardens' were responsible for the safety of their 'inmates', I put this all aside and read the rest of the slideshow, and was duly impressed. Very cool from a psychological point of view.
I am not a jolly man. Remove the mirth from my email to send.