Scores barely moved after reading a firsthand confession of mass murder

Evidence

I began with the usual pledge of secrecy and statement of neutrality in each condition. Then I added: “If you find some of the material too stressful to read, you should skip ahead a bit until you find you can continue. This may seem unnecessary to say, but I want you to know it is all right if you want to do so.” I put this in because of the Hoess confession, a truly horrific account if you stop to think about what he describes so matter of factly. — Bob Altemeyer, The Authoritarian Specter, 3185