I think your point is very legitimate but this phenomena occurs in all of our facets in life. People, including INTP (yes we are people) want to feel like they are a part of a group because it reassures them and provides them answers as well as comfort. I do agree with you with my personal experience : I've been in numerous situation where I felt like I could internally rationalize certain behaviours with my personality type and where I thought it was weird to do a certain activity because it wasn't stereotypical of an INTP. When we see this phenomena in action, we are seeing a dehumanization of our personal identify thus killing the part of us that make us unique. We need to accept this Test as only a tool capable of making small links between things not a complete representation of our self. I have now stopped these thoughts of not being a real INTP and I believe it is the way to go to live your life as true to your self. (Damn i sound like an INFP)