Bifurcation means fork. The infographic is trying to make the point that it is not an either/or situation with regards to belief in authority. I don’t know that I agree with the labels assigned or their definitions but what I can say from my readings is that 80-90% of people are Authority Credulists. They will do as authority tells them to do without moral evaluation or judgement. If you think what happened in Nazi Germany could not happen again you are not paying attention. Similar (and worse) catastrophes have happened many time since and one is presently being generated in the US.