The Overlord wrote:
They moved away from the Federation though,
At the end of the episode as part of the compromise that let them stay on the planet before that they were still federation citizens.
Why does everybody simply believe the words of the So'na? They cheated the Federation and stabbed it in the back so why shouldn't the have lied about the medical benefits of the radiation?
If anything is hypocritical it is this distasteful "working together with a bunch of murderous scumbags is a small price for XYZ" stance of Dougherty which many fans repeat without thinking or being aware of what they say.
plus the medical perks they would get from it are redundant seeing as using the transporter would do the same thing without having to waste a perfectly good planet.