I think you misread my statement.
Exactly.
And when it comes to Akatsuki,sane members are very much outnumbered by the insane even if some of the madness takes forms that are more functional and subtle than the others (Sasori for example) . I know you put Sasori as 'maybe sane', but I don't think turning your parents into puppets after they die is a big check in the column for mental stability, as further evidenced by allowing himself to die rather than fight those (nonsentient) puppets. Konan, Kakuzu, and Kisame are probably the sanest people in the organization. Maybe having a 'K' at the start of your name helps immunize you? I'm not sure if Kabuto's entirely sane, so only partially.
Anyway, this observation can be generalized outside of Akatsuki, since Tsunade and Orochimaru both have some clear mental hangups (whether it be a phobia of blood and a self-destructive streak or a desire to show off to and show up one's old sensei taken to the point of war).