Other than discussion, have there been objective experiements about it?
But has subjective experience and actual play born this out? Yes. I think it has.
Again, I don't think this is the place to discuss it, but I invite you to start a new thread titled: "System, does it really matter?" or "Systems aren't the Problem: People are the Problem". You think this thread has exploded...
Let me just say that if we took two games about betrayal: one is Paranoia and the second is the Mountain Witch, I can pretty much assure you both games play significantly different and would result in very, very, very different problems and issues showing up at the table. But I'll drop it... I'll copy and paste this into the thread you start on this subject.