Why is paranoid personality disorder a subforum of this one?

just wondering??

It doesn't beat "Obcessive-Compulsive Personality Disorder" being a subforum of Histrionic PD.

I think that the thing is probably just that they linked unused forums with ones that were used a lot. Sometimes the link is relatively strong (Schizotypal being a sub-forum of Schizoid), but sometimes the link is just plain bizarre (Obcessive-Compulsive being a sub-forum of Histrionic).

What I know is, that there is very much similaritys between these disorders! A social withdrawing behavior is almost certain a trigger for paranoid thoughts!