My point is that there's no in-story reason for Minthara to belong in a good party
Maybe a good-aligned PC thinks that Minthara can be redeemed and decides to knock her out non-lethally instead of kill her. Maybe they do the same to Ragzlin (though I've never tried).
Maybe the good-aligned PC can see that Minthara is a victim of the cult and may not appreciate her pragmatism and attitude but they are grateful to Minthara for sharing her experiences at Moonrise and finds the background she gives on Ketheric valuable, and while they don't appreciate her being in the party, they keep her around because they believe that being freed from the Absolute is a better fate while staying at camp than kicking her out of camp and the Prism's protection completely.
I don't think there's *no* in-story reason for Minthara to belong in a good party -- you just need some imagination and headcanon rationalization.
