The most dangerous idea I know of is emotional intelligence. Within the context of the cognitive neuroscience revolution in psychology, the focus on emotions is extraordinary. The over-arching idea that there is such a thing as emotional intelligence, that it has a neuroscience, that it is inter-personal, i.e., between two brains, rather than within one brain, are all quite revolutionary concepts about human psychology. I could go on. It is also a revolution in thinking about infancy, couples, family, adult development, aging, etc.
To arrive at the edge of the world's knowledge, seek out the most complex and sophisticated minds,
put them in a room together, and have them ask each other the questions they are asking themselves.