But the one thing we know for sure it's that the world is more complex than even this set of 10 pigeonholes. These are more like good insults for people. Haha, a loner, that guy's a schizo! The clinical coldness is almost a perfect mirror for the way we express personal cruelty to others. To reduce them to a factoid, an epithet. It's no wonder people want to reclaim these words as terms of identity, of pride, of nuanced meaning.
I mean, that is kind of how science/medicine work in general. Group the things that look similar, try and find things that work, and use the patterns to generalize the solution.
If you don't generalize you can't apply knowledge from other cases.