Real good reading and I’m so glad to know that there are people around asking this necessary questions. I believe much of this has to be a discussion that we need to take to almost every discipline.
There’s a part that I don’t like about this, because probably the people who work in those examples you put were at the time believing that their good design was to improving the world because their understanding of ethic is just plain different. Let's take, for example, the ones of the propaganda. What if they truly believe that Hitler was right and the Nazi regime was there to make the world better? That’s the part that really scares me.
Always is gonna depend on the people behind the product or service. And heck, even good design made with the best of intentions falling in the wrong hands can become a bad thing.