Keirsey isn't a threat. I think even a lot of people who'd question him would give him some credit as a respectable thinker.. but like many INTPs, he has a knack for building theoretical models and boxes for things, and that doesn't work for actual people. That kind of categorizing can get pretty claustrophobic from time to time. There is no harm in someone calling models into question, introducing more data, saying "consider this.. it's not that simple".... or "wait a minute". Just because someone does that doesn't give you the right to retype people. "Oh, you're looking deeper into things.. you must be an N. Nyah Nyah =P". For fuck's sake, man. If you think it's that objectionable, you're just being dogmatic. Not reasonable.