Kalamainu'u Iona was just an example. She also has high fitness skill so she's likely to show up at the gym (any world). These occults may not be obvious or harmful but it sounds like OP is against anything occult related and does not want one single occult in their game.
OP has another thread asking how to use MCCC to humanize all sims so it sounds like having occults in the game is not something they want at all cost. Ghost are a little hard to avoid since they are apart of BG.
I love occults personally but I understand it's not for everyone.