Well, IIRC, Dougherty does say that it would take ten years of normal exposure to the rings to heal the Son'a (presumably less long for less advanced ailments), and I can't exactly blame people for not wanting to sit around on the planet for a decade...
I don't feel we as an audience should have to assume that the Baku offered to help in any way not shown onscreen, especially given everything else we learn about their evident desire for isolation. Such a gesture would be significant enough to merit depiction. Besides, if it happened, why wouldn't there then be a discussion with the Son'a noting that they had been offered that option, or between Picard and Dougherty about it?
It's just like the Maquis who would rather have seen a war between the Federation and Cardassians that would likely have killed at least thousands than face the oh-so-terrible burden of abandoning their homes to move back to a land of virtually unlimited resources (thank you replicators).
Then there's the fact that they kicked their kids off the planet, and when the kids come back upset about it, there's no discussion of how such an advanced race could have exiled the kids before but couldn't do so again, nor of the fact that maybe the adults have to some degree reaped what they've sown.
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